publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2003-05-20 | Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering | We report a significant enhancement of the upper critical field $H_{c2}$ of
different $MgB_2$ samples alloyed with nonmagnetic impurities. By studying
films and bulk polycrystals with different resistivities $\rho$, we show a
clear trend of $H_{c2}$ increase as $\rho$ increases. One particular high
resistivity film had... | 0305474v2 |
2004-02-19 | Monte Carlo Study of the Precipitation Kinetics of Al3zr in Al-Zr | Zr precipitates in Al to form the phase Al3Zr. For a low supersaturation in
Zr of the fcc solid solution, it has been observed that during the
precipitation first steps the Al3Zr precipitates have the metastable L12
structure and that they transform themselves to the stable DO23 structure for
long enough annealing time... | 0402505v2 |
2006-10-03 | Spin-Diffusion Lengths in Metals and Alloys, and Spin-Flipping at Metal/Metal Interfaces: an Experimentalist's Critical Review | In magnetoresistive (MR) studies of magnetic multilayers composed of
combinations of ferromagnetic (F) and non-magnetic (N) metals, the magnetic
moment (or related 'spin') of each conduction electron plays a crucial role,
supplementary to that of its charge. While initial analyses of MR in such
multilayers assumed that... | 0610085v2 |
2008-04-16 | Surface States of the Topological Insulator Bi_{1-x}Sb_x | We study the electronic surface states of the semiconducting alloy BiSb.
Using a phenomenological tight binding model we show that the Fermi surface of
the 111 surface states encloses an odd number of time reversal invariant
momenta (TRIM) in the surface Brillouin zone confirming that the alloy is a
strong topological ... | 0804.2664v1 |
2010-10-25 | Calculation of angle-resolved photo emission spectra within the one-step model of photo emission - recent developments | Various technical developments enlarged the potential of angle-resolved photo
emission (ARPES) tremendously during the last one or two decades. In particular
improved momentum and energy resolution as well as the use of photon energies
from few eV up to several keV makes ARPES a rather unique tool to investigate
the el... | 1010.5086v1 |
2012-01-25 | Homogenous and heterogeneous magnetism in (Zn,Co)O | A series of (ZnO)m(CoO)n digital alloys and superlattices grown by atomic
layer deposition has been investigated by a range of experimental methods. The
data provide evidences that the Co interdiffusion in the digital alloy
structures is sufficient to produce truly random Zn1-xCoxO mixed crystals with
x up to 40%. Conv... | 1201.5268v1 |
2012-05-03 | Structural relationships among monoclinic and hexagonal phases and transition structures in Mg-Zn-Y alloys | Isothermal ageing of plastically deformed Mg-Zn-Y alloys resulted in
precipitation along {10-12} twin boundaries. The bulky precipitates formed had
structures similar to those recently reported for the rod-like \beta'
precipitates, but afforded a more detailed study by high resolution TEM due to
their larger size. The ... | 1205.0625v1 |
2012-06-03 | Fe-C and Fe-H systems at pressures of the Earth's inner core | The solid inner core of the Earth is predominantly composed of iron alloyed
with several percent Ni and some lighter elements, Si, S, O, H, and C being the
prime candidates. There have been a growing number of papers investigating C
and H as possible light elements in the core, but the results are
contradictory. Here, ... | 1206.0467v1 |
2012-10-10 | A topological crystalline insulator (TCI) phase via topological phase transition and crystalline mirror symmetry | A Z2 topological insulator protected by time-reversal symmetry is realized
via spin-orbit interaction driven band inversion. For example, the topological
phase in the Bi-Sb system is due to an odd number of band inversions. A related
spin-orbit system, the (Pb/Sn)Te class, has been known to contain an even
number of in... | 1210.2917v1 |
2013-03-12 | Valence Fluctuation in CeMo2Si2C | We report on the valence fluctuation of Ce in CeMo$_{2}$Si$_{2}$C as studied
by means of magnetic susceptibility $\chi(T)$, specific heat $C(T)$, electrical
resistivity $\rho(T)$ and x-ray absorption spectroscopy. Powder x-ray
diffraction revealed that CeMo$_{2}$Si$_{2}$C crystallizes in
CeCr$_{2}$Si$_{2}$C-type layere... | 1303.2801v1 |
2014-03-19 | Dirac mass generation from crystal symmetry breaking on the surfaces of topological crystalline insulators | The tunability of topological surface states (SS) and controllable opening of
the Dirac gap are of fundamental and practical interest in the field of
topological materials. In topological crystalline insulators (TCIs), a
spontaneously generated Dirac gap was recently observed, which was ascribed to
broken cubic crystal... | 1403.4906v2 |
2014-04-11 | Fermi Surface Properties, Metamgnetic Transition and Quantum Phase Transition of CeRu$_2$Si$_2$ and Its Alloys Probed by the dHvA Effect--Fermi Surface Studies on the Itinerant and Localized Dichotomy of $f$ Electron Nature | This article describes the Fermi surface properties of CeRu$_2$Si$_2$ and its
alloy systems CeRu$_2$(Si$_x$Ge$_{1-x}$)$_2$ and Ce$_x$La$_{1-x}$Ru$_2$Si$_2$
studied by the de Haas - van Alphen (dHvA) effect. We pay particular attention
to how the Fermi surface properties and the f electron state change with
magnetic pro... | 1404.2991v1 |
2014-08-14 | Review on magnetic and related properties of RTX compounds | RTX (R=rare earths, T= 3d/4d/5d, transition metals such as Sc, Ti, Mn, Fe,
Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt, Au, and X=p-block elements such as Al,
Ga, In, Si, Ge, Sn, As, Sb, Bi) series is a huge family of intermetallics
compounds. These compounds crystallize in different crystal structures
depending on the cons... | 1408.3238v1 |
2015-02-20 | Magnetic properties of (Fe$_{1-x}$Co$_x$)$_2$B alloys and the effect of doping by 5$d$ elements | We have explored, computationally and experimentally, the magnetic properties
of \fecob{} alloys. Calculations provide a good agreement with experiment in
terms of the saturation magnetization and the magnetocrystalline anisotropy
energy with some difficulty in describing Co$_2$B, for which it is found that
both full p... | 1502.05916v3 |
2015-01-27 | Thermodynamic model of solute site preferences in ordered alloys | A thermodynamic model based on the law of mass action is used to calculate
concentrations of elementary point defects and to determine site preferences of
solute atoms in ordered alloys. Combinations of lattice vacancies, antisite
atoms and host interstitials that form equilibrium defects are enumerated for
the CsCl (B... | 1503.08068v1 |
2015-06-30 | Materials with low DC magnetic susceptibility for sensitive magnetic measurements | Materials with very low DC magnetic susceptibility have many scientific
applications. To our knowledge however, relatively little research has been
conducted with the goal to produce a totally nonmagnetic material. This phrase
in our case means after spatially averaging over macroscopic volumes, it
possesses an average... | 1506.09199v1 |
2016-01-29 | Applicability of DFT + U to U metal and U-Zr alloy | In the Letter [J. Nucl. Mater. 444, 356 (2014)] and Comment [Phys Rev B 90,
157101 (2014)], Soderlind et al. argue that 1) DFT based on GGA already models
U metal and U-Zr alloy accurately, and 2) DFT + U models them worse than DFT
according to results they calculate or select from our recent study [Phys. Rev.
B 88, 23... | 1601.07959v1 |
2016-05-11 | Experimental studies of crystal nucleation: metals and colloids | Crystallization is one of the most important phase transformations of first
order. In the case of metals and alloys, the liquid phase is the parent phase
of materials production. The conditions of the crystallization process control
the as-solidified material in its chemical and physical properties. Nucleation
initiate... | 1605.03511v2 |
2016-10-26 | Glass transitions, semiconductor-metal (SC-M) transitions and fragilities in Ge-V-Te (V=As, or Sb) liquid alloys: the difference one element can make | Glass transition temperatures (Tg) and liquid fragilities are measured along
a line of constant Ge content in the system Ge-As-Te, and contrasted with the
lack of glass-forming ability in the twin system Ge-Sb-Te at the same Ge
content. The one composition established as free of crystal contamination in
the latter syst... | 1610.08164v2 |
2017-03-09 | Material developments and domain wall based nanosecond-scale switching process in perpendicularly magnetized STT-MRAM cells | We investigate the Gilbert damping and the magnetization switching of
perpendicularly magnetized FeCoB-based free layers embedded in tunnel junctions
adequate for spin-torque operated memories. We study the influence of the boron
content in MgO / FeCoB /Ta systems alloys on their Gilbert damping after
crystallization a... | 1703.03198v3 |
2017-09-26 | Defect Role in the Carrier Tunable Topological Insulator (Bi$_{1-x}$Sb$_x$)$_2$Te$_3$ Thin Films | Alloys of Bi$_2$Te$_3$ and Sb$_2$Te$_3$ ((Bi$_{1-x}$Sb$_x$)$_2$Te$_3$) have
played an essential role in the exploration of topological surface states,
allowing us to study phenomena that would otherwise be obscured by bulk
contributions to conductivity. Thin films of these alloys have been
particularly important for tu... | 1709.09133v1 |
2018-01-11 | Ferromagnetic Quantum Critical Point in CePd$_2$P$_2$ with Pd $\rightarrow$ Ni Substitution | An investigation of the structural, thermodynamic, and electronic transport
properties of the isoelectronic chemical substitution series
Ce(Pd$_{1-x}$Ni$_x$)$_2$P$_2$ is reported, where a possible ferromagnetic
quantum critical point is uncovered in the temperature - concentration ($T-x$)
phase diagram. This behavior r... | 1801.04000v3 |
2018-05-07 | Diffusion and Phase Evolution in Multicomponent Multi-Phase Alloys | Diffusion in ternary, multiphase systems was studied theoretically and
experimentally in Ni-Cr-Al system at 1200C. The samples were prepared by the
multiple method. It has been shown that the method allows obtaining good
quality, planar, reproducible and oxide-free diffusion couples. For the first
time the concentratio... | 1805.02388v1 |
2018-05-21 | Towards Ultra Low Cobalt Cathodes: A High Fidelity Computational Phase Search of Layered Li-Ni-Mn-Co Oxides | Layered Li(Ni,Mn,Co,)O$_2$ (NMC) presents an intriguing ternary alloy design
space for optimization as a cathode material in Li-ion batteries. Recently, the
high cost and resource limitations of Co have added a new design constraint and
high Ni-containing NMC alloys have gained enormous attention despite possible
perfo... | 1805.08171v2 |
2019-11-08 | Room Temperature Spin to Charge Conversion in Amorphous Topological Insulating Gd-Alloyed BixSe1-x/CoFeB Bilayers | Disordered topological insulator (TI) films have gained intense interest by
benefiting from both the TIs exotic transport properties and the advantage of
mass production by sputtering. Here, we report on the clear evidence of
spin-charge conversion (SCC) in amorphous Gd-alloyed BixSe1-x (BSG)/CoFeB
bilayers fabricated ... | 1911.03323v12 |
2019-11-22 | Role of Element-Specific Damping on the Ultrafast, Helicity-Independent All-Optical Switching Dynamics in Amorphous (Gd,Tb)Co Thin Films | Ultrafast control of the magnetization in ps timescales by fs laser pulses
offers an attractive avenue for applications such as fast magnetic devices for
logic and memory. However, ultrafast helicity-independent all-optical switching
(HI-AOS) of the magnetization has thus far only been observed in Gd-based,
ferrimagnet... | 1911.09803v3 |
2020-01-15 | Polymorphism and superconductivity in the V-Nb-Mo-Al-Ga high-entropy alloys | High-entropy alloys (HEAs) are at the focus of current research for their
diverse properties, including superconductivity and structural polymorphism.
However, the polymorphic transition has been observed only in
nonsuperconducting HEAs and mostly under high pressure. Here we report the
discovery of superconductivity a... | 2001.05193v1 |
2021-07-16 | Intra-unitcell cluster-cluster magnetic compensation and large exchange bias in cubic alloys | Composite quantum materials are the ideal examples of multifunctional systems
which simultaneously host more than one novel quantum phenomenon in physics.
Here, we present a combined theoretical and experimental study to demonstrate
the presence of an extremely large exchange bias in the range 0.8 T - 2.7 T and
a fully... | 2107.07742v1 |
2021-07-16 | A growth diagram for chemical beam epitaxy of GaP$_{1-x}$N$_{x}$ alloys on nominally $(001)$-oriented GaP-on-Si substrates | The dilute-nitride ternary compound GaP$_{1-x}$N$_{x}$ is highly attractive
to monolithically integrate pseudomorphic red light-emitting devices and
photovoltaic cells with the standard Si technology because it is lattice
matched to Si with a direct band gap of $\approx1.96$ eV for $x=0.021$. Here,
we report on the che... | 2107.07848v2 |
2017-04-18 | Localization landscape theory of disorder in semiconductors II: Urbach tails of disordered quantum well layers | Urbach tails in semiconductors are often associated to effects of
compositional disorder. The Urbach tail observed in InGaN alloy quantum wells
of solar cells and LEDs by biased photocurrent spectroscopy is shown to be
characteristic of the ternary alloy disorder. The broadening of the absorption
edge observed for quan... | 1704.05524v1 |
2017-05-17 | InGaN Metal-IN Solar Cell: optimized efficiency and fabrication tolerance | Choosing the Indium Gallium Nitride (InGaN) ternary alloy for thin films
solar cells might yield high benefits concerning efficiency and reliability,
because its bandgap can be tuned through the Indium composition and radiations
have little destructive effect on it. It may also reveal challenges because
good quality p-... | 1705.08256v1 |
2018-07-05 | Mineralogy, structure and habitability of carbon-enriched rocky exoplanets: A laboratory approach | Carbon-enriched rocky exoplanets have been proposed around dwarf stars as
well as around binary stars, white dwarfs and pulsars. However, the
mineralogical make up of such planets is poorly constrained. We performed
high-pressure high-temperature laboratory experiments ($P$ = 1$-$2 GPa, $T$ =
1523$-$1823 K) on carbon-e... | 1807.02064v2 |
2018-07-27 | Magnetocrystalline anisotropy of Fe5PB2 and its alloys with Co and 5d elements: a combined first-principles and experimental study | The Fe$_5$PB$_2$ compound offers tunable magnetic properties via the
possibility of various combinations of substitutions on the Fe and P-sites.
Here, we present a combined computational and experimental study of the
magnetic properties of (Fe$_{1-x}$Co$_{x}$)$_5$PB$_2$. Computationally, we are
able to explore the full... | 1807.10649v3 |
2014-06-02 | Compositional dependence of the direct and indirect band gaps in $\text{Ge}_{1-y}\text{Sn}_{y}$ alloys from room temperature photoluminescence | The compositional dependence of the lowest direct and indirect band gaps in
$\text{Ge}_{1-y}\text{Sn}_{y}$ has been determined from room-temperature
photoluminescence measurements. This technique is particularly attractive for a
comparison of the two transitions because distinct features in the spectra can
be associate... | 1406.0448v1 |
2018-12-01 | Extrinsic n-type semiconductor transition in ZrSe2 with the metallic character through hafnium substitution | Two dimensional layered materials exhibit versatile electronic properties in
their different phases. The intrinsic electronic properties of these materials
can be modulated through doping or intercalation. In this study, we
investigated the electronic properties of Hf doped ZrSe2 single crystals using
angle-resolved ph... | 1812.00157v2 |
2018-11-25 | Accelerating Photovoltaic Materials Development via High-Throughput Experiments and Machine-Learning-Assisted Diagnosis | Accelerating the experimental cycle for new materials development is vital
for addressing the grand energy challenges of the 21st century. We fabricate
and characterize 75 unique halide perovskite-inspired solution-based thin-film
materials within a two-month period, with 87% exhibiting band gaps between 1.2
eV and 2.4... | 1812.01025v1 |
2019-02-03 | On the effect of Re addition on microstructural evolution of a CoNi-based superalloy | In this study, the effect of rhenium (Re) addition on microstructural
evolution of a new low-density Co-Ni-Al-Mo-Nb based superalloy is presented.
Addition of Re significantly influences the {\gamma}' precipitate morphology,
the {\gamma}/{\gamma}' lattice misfit and the {\gamma}/{\gamma}'
microstructural stability duri... | 1902.00857v1 |
2019-02-15 | Gutzwiller projection for exclusion of holes: Application to strongly correlated Ionic Hubbard Model and Binary Alloys | We consider strongly correlated limit of variants of the Hubbard model (HM)
in which on parts of the system it is energetically favourable to project out
doublons from the low energy Hilbert space while on other sites of the system
it is favourable to project out holes while still allowing for doublons. As an
effect th... | 1902.05920v2 |
2020-04-09 | Domain formation in the deposition of thin films of two-component mixtures | We perform a kinetic Monte Carlo simulation study of a model of thin film
deposition of a two-component mixture in which the activation energy for
diffusion of an adatom is additive over its nearest neighbors and in which the
interactions between adatoms of the same species are stronger than those
between adatoms of di... | 2004.04853v2 |
2020-05-12 | Defect filtering for thermal expansion induced dislocations in III-V lasers on silicon | Epitaxially integrated III-V semiconductor lasers for silicon photonics have
the potential to dramatically transform information networks, but currently,
dislocations limit performance and reliability even in defect tolerant InAs
quantum dot (QD) based lasers. Despite being below critical thickness, QD
layers in these ... | 2005.06066v3 |
2020-05-21 | Repairing and Mechanising the JavaScript Relaxed Memory Model | Modern JavaScript includes the SharedArrayBuffer feature, which provides
access to true shared memory concurrency. SharedArrayBuffers are simple linear
buffers of bytes, and the JavaScript specification defines an axiomatic relaxed
memory model to describe their behaviour. While this model is heavily based on
the C/C++... | 2005.10554v2 |
2021-03-04 | Crater shape as a possible record of the impact environment of metallic bodies: Effects of temperature, impact velocity and impactor density | Metallic bodies that were the cores of differentiated bodies are sources of
iron meteorites and are considered to have formed early in the terrestrial
planet region before migrating to the main asteroid belt. Surface temperatures
and mutual collision velocities differ between the terrestrial planet region
and the main ... | 2103.03128v2 |
2022-02-09 | Potential Tribological and Antibacterial Benefits of Pulsed Laser Deposited Zirconia Thin Film on Ti6Al4V Bio-alloy | Demand for artificial body implants has been on the rise over the years.
However, wear and bacterial infection are identified as two major reasons that
can lead to inflammation and implant failure. In this communication, the
advantages of pulsed laser deposited zirconia thin film on Ti6Al4V bio-alloy at
room temperatur... | 2202.04290v1 |
2016-03-01 | Magnetic properties of Fe$_5$SiB$_2$ and its alloys with P, S, and Co | Fe$_5$SiB$_2$ has been synthesized and magnetic measurements have been
carried out, revealing that M$_{\text{sat}}$ = 0.92 MA/m at T = 300 K. The M vs
T curve shows a broad peak around T = 160 K. The anisotropy constant, K$_1$,
estimated at T = 300 K, is 0.25 MJ/m$^3$. Theoretical analysis of Fe$_5$SiB$_2$
system has b... | 1603.00253v1 |
2017-06-21 | Electronic bandstructure and optical gain of lattice matched III-V dilute nitride bismide quantum wells for 1.55 $μ$m optical communication systems | Dilute nitride bismide GaNBiAs is a potential semiconductor alloy for near-
and mid-infrared applications, particularly in 1.55 $\mu$m optical
communication systems. Incorporating dilute amounts of Bismuth (Bi) into GaAs
reduces the effective bandgap rapidly, while significantly increasing the
spin-orbit-splitting ener... | 1706.07007v1 |
2017-10-06 | Combined Machine Learning and CALPHAD Approach for Discovering Processing-Structure Relationships in Soft Magnetic Alloys | We aim to investigate relationships between select processing parameters or
inputs (composition, temperature, annealing time) and two structural
parameters, specifically, the mean radius and volume fraction of the Fe$_3$Si
nanocrystals. To this end, we have deviced a combined CALPHAD and machine
learning approach that ... | 1710.02605v4 |
2018-04-04 | Crystal plasticity simulation of the effect of grain size on the fatigue behavior of polycrystalline Inconel 718 | A microstructure-based model that accounts for the effect of grain size has
been developed to study the effect of grain size on the fatigue life of Inconel
718 alloys. The fatigue behavior of two alloys with different grain size was
determined by means of uniaxial cyclic deformation tests under fully-reversed
deformati... | 1804.01515v2 |
2019-03-22 | Artificial intelligence-based process for metal scrap sorting | Machine learning offers remarkable benefits for improving workplaces and
working conditions amongst others in the recycling industry. Here e.g.
hand-sorting of medium value scrap is labor intensive and requires experienced
and skilled workers. On the one hand, they have to be highly concentrated for
making proper readi... | 1903.09415v1 |
2019-09-18 | Towards low-loss telecom-wavelength photonic devices by designing GaBi$_{x}$As$_{1-x}$/GaAs core$-$shell nanowires | Nanowires are versatile nanostructures, which allow an exquisite control over
bandgap energies and charge carrier dynamics making them highly attractive as
building blocks for a broad range of photonic devices. For optimal solutions
concerning device performance and cost, a crucial element is the selection of a
suitabl... | 1909.08312v2 |
2019-12-23 | Towards an understanding of the chemisorption and catalytic activity of Pd$_{X}$Ru$_{1-X}$ nanoparticles using photoelectron spectroscopy | Chemisorption process and catalytic activity of CO to CO2 conversion on
PdXRu1-X (X : 0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1) extended as a benchmark for
further investigation of very complex nanoparticle (NP) structures have been
checked into thoroughly by using the synchrotron-based hard X-ray photoelectron
spectroscopy (H... | 1912.10681v1 |
2020-02-04 | Magnetic behavior of a ferro-ferrimagnetic ternary alloy AB$_ρ$C$_{1-ρ}$ with a selective site disorder: the case study of a mixed-spin Ising model on a honeycomb lattice | Phase transitions, compensation phenomenon and magnetization of a
ferro-ferrimagnetic ternary alloy AB$_{\rho}$C$_{1-\rho}$ composed of three
different kinds of magnetic ions A, B and C with the spin magnitude 1/2, 1 and
3/2 are examined within the framework of a mixed-spin Ising model on a
honeycomb lattice with a sel... | 2002.01572v1 |
2020-02-06 | Reversible Al Propagation in Si$_x$Ge$_{1-x}$ Nanowires | While reversibility is a fundamental concept in thermodynamics, most
reactions are not readily reversible, especially in solid state physics. For
example, thermal diffusion is a widely known concept, used among others to
inject dopant atoms into the substitutional positions in the matrix and improve
the device properti... | 2002.02373v1 |
2020-02-18 | Microstructure Design of Low-Melting-Point Alloy (LMPA)/ Polymer Composites for Dynamic Dry Adhesion Tuning in Soft Gripping | Tunable dry adhesion is a crucial mechanism in compliant manipulation. The
gripping force, mainly originated from the van der Waals force between the
adhesive composite and the object to be gripped, can be controlled by
reversibly varying the physical properties (e.g., stiffness) of the composite
via external stimuli. ... | 2002.07882v1 |
2020-03-03 | Filled Carbon Nanotubes as Anode Materials for Lithium-Ion Batteries | Downsizing well-established materials to the nanoscale is a key route to
novel functionalities, in particular if different functionalities are merged in
hybrid nanomaterials. Hybrid carbon-based hierarchical nanostructures are
particularly promising for electrochemical energy storage since they combine
benefits of nano... | 2003.01379v1 |
2020-09-12 | Ferrimagnetic States of Na-K Alloy Clusters in Zeolite Low-Silica X | In zeolite low-silica X (LSX), beta-cages with the inside diameter of approx
7 AA{} are arrayed in a diamond structure. Among them, supercages with the
inside diameter of approx 13 AA{} are formed and arrayed in a diamond structure
by the sharing of windows with the inside diameter of approx 8 AA{}. The
chemical formul... | 2009.05742v1 |
2020-10-26 | Solubility limit of Ge Dopants in AlGaN: a Chemical and Microstructural Investigation down to the Nanoscale | Attaining low resistivity AlGaN layers is the keystone to improve the
efficiency of light emitting devices in the ultraviolet spectral range. Here,
we present a microstructural analysis of Ge-doped AlGaN samples with Al mole
fraction from x=0 to 1, and nominal doping level in the range of 1E20 cm-3,
together with the m... | 2010.13577v1 |
2020-12-01 | $γ$-phase Inclusions as Common Defects in Alloyed $β$-(Al$_x$Ga$_{1\text{-}x}$)$_2$O$_3$ and Doped $β$-Ga$_2$O$_3$ Films | $\beta$-Ga$_2$O$_3$ is a promising ultra-wide bandgap semiconductor whose
properties can be further enhanced by alloying with Al. Here, using
atomic-resolution scanning transmission electron microscopy (STEM), we find the
thermodynamically-unstable $\gamma$-phase is a ubiquitous defect in both
$\beta$-(Al$_x$Ga$_{1\tex... | 2012.00263v1 |
2020-12-08 | Large magneto-optical effect and magnetic anisotropy energy in two-dimensional metallic ferromagnet Fe$_3$GeTe$_2$ | Few layers Fe$_3$GeTe$_2$ is currently the only atomically thin ferromagnetic
metal, and thus has drawn huge attention in the field of two-dimensional (2D)
magnetism. In this paper, we perform a systematic first principle study on the
electronic structure, magnetic anisotropy energy (MAE), and magneto-optical
(MO) effe... | 2012.04285v2 |
2020-12-21 | Reduced lasing thresholds in GeSn microdisk cavities with defect management of the optically active region | GeSn alloys are nowadays considered as the most promising materials to build
Group IV laser sources on silicon (Si) in a full complementary metal oxide
semiconductor-compatible approach. Recent GeSn laser developments rely on
increasing the band structure directness, by increasing the Sn content in thick
GeSn layers gr... | 2012.11262v1 |
2021-01-28 | Temperature dependence of magnetization processes in Sm(Co,Fe,Cu,Zr)$_z$ magnets with different nanoscale microstructures | The characteristic microstructure of Sm(Co,Fe,Cu,Zr)$_z$ alloys with SmCo$_5$
cell walls in Sm$_2$Co$_{17}$ cells, all intersected by Zr-rich platelets,
makes them some of the best performing high-temperature permanent magnets.
Plentiful research has been performed to tailor the microstructure at the
nanoscale, but due... | 2101.12076v1 |
2021-10-08 | High Spatial Resolution Neutron Transmission Imaging Using a Superconducting Two-Dimensional Detector | Neutron imaging is one of the most powerful tools for nondestructive
inspection owing to the unique characteristics of neutron beams, such as high
permeability for many heavy metals, high sensitivity for certain light
elements, and isotope selectivity owing to a specific nuclear reaction between
an isotope and neutrons... | 2110.03976v1 |
2021-10-12 | Mixed Alkali-Ion Transport and Storage in Atomic-Disordered Honeycomb Layered $\rm NaKNi_2TeO_6$ | Honeycomb layered oxides constitute an emerging class of materials that show
interesting physicochemical and electrochemical properties. However, the
development of these materials is still limited. Here, we report the combined
use of alkali atoms ($\rm Na$ and $\rm K$) to produce a mixed alkali honeycomb
layered oxide... | 2110.05879v1 |
2021-10-15 | Performance, Successes and Limitations of Deep Learning Semantic Segmentation of Multiple Defects in Transmission Electron Micrographs | In this work, we perform semantic segmentation of multiple defect types in
electron microscopy images of irradiated FeCrAl alloys using a deep learning
Mask Regional Convolutional Neural Network (Mask R-CNN) model. We conduct an
in-depth analysis of key model performance statistics, with a focus on
quantities such as p... | 2110.08244v1 |
2021-11-13 | Role of carbon and hydrogen in limiting $n$-type doping of monoclinic (Al$_x$Ga$_{1-x}$)$_2$O$_3$ | We use hybrid density functional calculations to assess n-type doping in
monoclinic (Al$_x$Ga$_{1-x}$)$_2$O$_3$ alloys. We focus on Si, the most
promising donor dopant, and study the structural properties, formation energies
and charge-state transition levels of its various configurations. We also
explore the impact of... | 2111.07194v2 |
2022-05-19 | An Effective Activation Method for Industrially Produced TiFeMn Powder for Hydrogen Storage | This work proposes an effective thermal activation method with low technical
effort for industrially produced titanium-iron-manganese powders (TiFeMn) for
hydrogen storage. In this context, the influence of temperature and particle
size of TiFeMn on the activation process is systematically studied. The results
obtained... | 2205.09429v2 |
2022-11-30 | Partial crystallization in a Zr-based bulk metallic glass in selective laser melting | Metals in amorphous state are promising for the use as structural materials
due to their superior properties related to the absence of grain boundaries and
dislocations.Obtaining the amorphous state requires quenching with a high
cooling rate.In conventional technologies,this is the reason for a considerable
size limit... | 2211.17140v1 |
2023-01-30 | Designing magnetocaloric materials for hydrogen liquefaction with light rare-earth Laves phases | Magnetocaloric hydrogen liquefaction could be a "game-changer" for liquid
hydrogen industry. Although heavy rare-earth-based magnetocaloric materials
show strong magnetocaloric effects in the temperature range required by
hydrogen liquefaction (77 ~ 20 K), the high resource criticality of the heavy
rare-earth elements ... | 2301.12773v4 |
2023-02-08 | Bioabsorbable WE43 Mg alloy wires modified by continuous plasma electrolytic oxidation for implant applications. Part II: degradation and biological performance | The corrosion, mechanical degradation and biological performance of
cold-drawn WE43 Mg wires were analyzed as a function of thermo-mechanical
processing and the presence of a protective oxide layer created by continuous
plasma electrolytic oxidation (PEO). It was found that the corrosion properties
of the non-surface-t... | 2302.13778v1 |
2023-02-28 | Optimization of Permalloy properties for magnetic field sensors using He$^+$ irradiation | Permalloy, despite being a widely utilized soft magnetic material, still
calls for optimization in terms of magnetic softness and magnetostriction for
its use in magnetoresistive sensor applications. Conventional annealing methods
are often insufficient to locally achieve the desired properties for a narrow
parameter r... | 2302.14455v2 |
2023-05-23 | Three-dimensional atomic positions and local chemical order of medium- and high-entropy alloys | Medium- and high-entropy alloys (M/HEAs) mix multiple principal elements with
near-equiatomic composition and represent a paradigm-shift strategy for
designing new materials for metallurgy, catalysis, and other fields. One of the
core hypotheses of M/HEAs is lattice distortion. However, experimentally
determining the 3... | 2305.14123v1 |
2023-05-29 | Ultra-small topological spin textures with size of 1.3nm at above room temperature in Fe78Si9B13 amorphous alloy | Topologically protected spin textures, such as skyrmions1,2 and vortices3,4,
are robust against perturbations, serving as the building blocks for a range of
topological devices5-9. In order to implement these topological devices, it is
necessary to find ultra-small topological spin textures at room temperature,
because... | 2305.17880v1 |
2023-06-26 | Multiscale insight into the Cd1-xZnxTe vibrational-mechanical properties -- High-pressure experiments and ab initio calculations | The Cd1-xZnxTe semiconductor alloy is a regular system regarding its
macroscopic mechanic properties in that its experimental bulk modulus exhibits
a linear x-dependence, in line with ab initio predictions. Complexity arises at
the bond scale, referring to the intricate Cd1-xZnxTe percolation-type Raman
pattern [T. Alh... | 2306.14539v1 |
2023-07-03 | A review of uranium-based thin films | Thin films based on silicon and transition-metal elements dominate the
semiconducting industry and are ubiquitous in all modern devices. Films have
also been produced in the rare-earth series of elements for both research and
specialized applications. Thin films of uranium and uranium dioxide were
fabricated in the 196... | 2307.01018v1 |
2023-10-11 | Absence of topological Hall effect in Fe$_x$Rh$_{100-x}$ epitaxial films: revisiting their phase diagram | A series of Fe$_x$Rh$_{100-x}$ ($30 \leq x \leq 57$) films were epitaxially
grown using magnetron sputtering, and were systematically studied by
magnetization-, electrical resistivity-, and Hall resistivity measurements.
After optimizing the growth conditions, phase-pure Fe$_{x}$Rh$_{100-x}$ films
were obtained, and th... | 2310.07140v1 |
2023-10-22 | Microstructure evolution and characteristics of laser-clad lightweight refractory NbxMo$_{0.5}$Ti$_{1.5}$Ta$_{0.2}$Cr high-entropy alloy | Lightweight refractory high-entropy alloy coatings (RHEAcs) of
NbxMo$_{0.5}$Ti$_{1.5}$Ta$_{0.2}$Cr (where $x=$ 1, 1.3, 1.5, and 2) were
fabricated on the surface of 316L stainless steel using laser cladding (LC)
technology. A comprehensive study was conducted to elucidate the effect of Nb
content on the microstructure,... | 2310.14223v1 |
2023-11-06 | Grain-level effects on in-situ deformation-induced phase transformations in a complex-phase steel using 3DXRD and EBSD | A novel complex-phase steel alloy is conceived with a deliberately unstable
austenite, $\gamma$, phase that enables the deformation-induced martensitic
transformations (DIMT) to be explored at low levels of plastic strain. The DIMT
was thus explored, in-situ and non-destructively, using both far-field
Three-Dimensional... | 2311.03088v2 |
2024-03-01 | Electrochemical Evaluation of Mg and a Mg-Al 5%Zn Metal Rich Primers for Protection of Al-Zn-Mg-Cu Alloy in NaCl | High purity magnesium and a Mg-Al 5wt% Zn metal rich primer (MRP) were
compared for their ability to suppress intergranular corrosion (IGC) and
intergranular stress corrosion cracking (IG-SCC) in peak aged AA 7075-T651 by
sacrificial anode-based cathodic prevention. Tests were conducted in 0.6 M NaCl
solution under ful... | 2403.00610v1 |
2024-03-07 | Effects of mechanical stress, chemical potential, and coverage on hydrogen solubility during hydrogen enhanced decohesion of ferritic steel grain boundaries: A first-principles study | Hydrogen enhanced decohesion (HEDE) is one of the many mechanisms of hydrogen
embrittlement, a phenomenon which severely impacts structural materials such as
iron and iron alloys. Grain boundaries (GBs) play a critical role in this
mechanism, where they can provide trapping sites or act as hydrogen diffusion
pathways. ... | 2403.04741v1 |
2024-03-14 | Fracture of the $C$15 CaAl$_2$ Laves phase at small length-scales | The cubic $C$15 CaAl$_2$ Laves phase is a crucial brittle intermetallic
precipitate in Mg-Al-Ca alloys. Although knowledge of the mechanical properties
of coexisting phases is essential for improved alloy design, the fracture
toughness is not yet studied experimentally due to the need for miniaturised
testing. Here, mi... | 2403.09461v1 |
2024-04-09 | Thermoelectric transport and current noise through a multilevel Anderson impurity: Three-body Fermi-liquid corrections in quantum dots and magnetic alloys | We present a comprehensive Fermi-liquid description for thermoelectric
transport and current noise, applicable to multilevel quantum dots (QD) and
magnetic alloys (MA) without electron-hole or time-reversal symmetry. Our
formulation for the low-energy transport is based on an Anderson model with $N$
discrete impurity l... | 2404.05947v1 |
1995-08-17 | Reproducible noise in a macroscopic system: magnetic avalanches in Perminvar | A study of magnetic avalanches in Perminvar, an Fe-Ni-Co alloy, shows that
some avalanches are almost exactly reproducible from one magnetic field cycle
to the next, while others show significant variability. Averaging over many
cycles produces a fingerprint reflecting the reproducibility of the noise. The
fingerprint ... | 9508005v1 |
2002-11-07 | On the origin of irregular structure in Saturn's rings | We suggest that the irregular structure in Saturn's B ring arises from the
formation of shear-free ring-particle assemblies of up to ~100 km in radial
extent. The characteristic scale of the irregular structure is set by the
competition between tidal forces and the yield stress of these assemblies; the
required tensile... | 0211149v1 |
1997-04-29 | Phase Segregation Dynamics in Particle Systems with Long Range Interactions I: Macroscopic Limits | We present and discuss the derivation of a nonlinear non-local
integro-differential equation for the macroscopic time evolution of the
conserved order parameter of a binary alloy undergoing phase segregation. Our
model is a d-dimensional lattice gas evolving via Kawasaki exchange dynamics,
i.e. a (Poisson) nearest-neig... | 9705001v1 |
1992-04-23 | Tweed in Martensites: A Potential New Spin Glass | We've been studying the ``tweed'' precursors above the martensitic transition
in shape--memory alloys. These characteristic cross--hatched modulations occur
for hundreds of degrees above the first--order shape--changing transition. Our
two--dimensional model for this transition, in the limit of infinite elastic
anisotr... | 9204012v1 |
1993-05-14 | Elastic anomaly of heavy fermion systems in a crystalline field | An elastic anomaly, observed in the heavy fermi liquid state of Ce alloys
(for example, CeCu$_6$ and CeTe), is analyzed by using the infinite-$U$
Anderson lattice model. The four atomic energy levels are assumed for
f-electrons. Two of them are mutually degenerate. A small crystalline splitting
$2\Delta$ is assumed bet... | 9305013v1 |
1993-07-13 | Theory of Adsorption and Surfactant Effect of Sb on Ag (111) | We present first-principles studies of the adsorption of Sb and Ag on clean
and Sb-covered Ag (111). For Sb, the {\it substitutional} adsorption site is
found to be greatly favored with respect to on-surface fcc sites and to
subsurface sites, so that a segregating surface alloy layer is formed. Adsorbed
silver adatoms ... | 9307024v1 |
1993-07-28 | Elastic anomaly of heavy fermion systems in a crystalline field II | An elastic anomaly, observed in the heavy Fermi liquid state of Ce alloys
(for example, CeCu_6 and CeTe), is analyzed by using the infinite-U Anderson
lattice model. Four atomic energy levels are assumed for f-electrons. Two of
them are mutually degenerate. A small crystalline splitting 2 Delta is assumed
between two e... | 9307058v1 |
1994-04-05 | Manifestation of Quantum Chaos in Electronic Band Structures | We use semiconductors as an example to show that quantum chaos manifests
itself in the energy spectrum of crystals. We analyze the {\it ab initio} band
structure of silicon and the tight-binding spectrum of the alloy
$Al_xGa_{1-x}As$, and show that some of their statistical properties obey the
universal predictions of ... | 9404005v1 |
1994-06-06 | Volume Effect in the Landau Theory of Martensitic Phase Transitions in Cubic Crystals | An effect of the volume change upon proper ferroelastic (martensitic) phase
transitions in cubic crystals is considered. Corresponding terms in the
Ginzburg-Landau expansion of the Gibbs free energy are analyzed for the first-
as well as second-order phase transitions from cubic to tetragonal lattice
under the action o... | 9406030v2 |
1994-11-28 | Quantum Interference of Coulomb Interaction and Disorder: Phase Shift of Friedel Oscillations and an Instability of the Fermi Sea | We investigate the influence of interference between Coulomb interaction and
impurity scattering on the static electronic response $\chi (0,q)$ in
disordered metals to leading order in the effective Coulomb interaction. When
the transport relaxation time $\tau _{tr}$ is much shorter than the
quasiparticle life time, we... | 9411122v1 |
1994-12-05 | Theory of One-Channel vs. Multi-Channel Kondo Effects for Ce$^{3+}$ Impurities | We introduce a model for Ce$^{3+}$ impurities in cubic metals which exhibits
competition between the Fermi-liquid fixed point of the single channel Kondo
model and the non-Fermi-liquid fixed point of the two- and three-channel Kondo
models. Using the non-crossing approximation and scaling theory, we find: (i) A
possibl... | 9412024v2 |
1995-02-13 | Disorder-Driven Pretransitional Tweed in Martensitic Transformations | Defying the conventional wisdom regarding first--order transitions, {\it
solid--solid displacive transformations} are often accompanied by pronounced
pretransitional phenomena. Generally, these phenomena are indicative of some
mesoscopic lattice deformation that ``anticipates'' the upcoming phase
transition. Among thes... | 9502054v1 |
1995-08-17 | Approximation of excitonic absorption in disordered systems using a compositional component weighted CPA | Employing a recently developed technique of component weighted two particle
Green's functions in the CPA of a binary substitutional alloy $A_cB_{1-c}$ we
extend the existing theory of excitons in such media using a contact potential
model for the interaction between electrons and holes to an approximation which
interpo... | 9508070v2 |
1995-08-29 | One-, Two-, and Three-channel Kondo effects for a model Ce$^{3+}$ Impurity in a Metal | We present studies of a simple Anderson model Hamiltonian for Ce$^{3+}$ ions
in cubic symmetry with three configurations ($f^0$,$f^1$,$f^2$). Our
Hamiltonian includes: (i) One-channel Anderson model; (ii) Two-channel Anderson
model. Using the third order scaling analysis, we study stability of the
non-Fermi liquid fixe... | 9508129v1 |
1993-02-13 | Structure of binary clusters: are icosahedra relevant ? | We investigate the structure of 13-particle clusters in binary alloys for
various size ratios and different concentrations via MD simulation. Our goal is
to predict which systems are likely to form local icosahedral structures when
rapidly supercooled from the melt. We calculate the energy spectrum of the
minimal energ... | 9511107v1 |
1996-02-07 | Proof of phase separation in the binary-alloy problem: the one-dimensional spinless Falicov-Kimball model | The ground states of the one-dimensional Falicov-Kimball model are
investigated in the small-coupling limit, using nearly degenerate perturbation
theory. For rational electron and ion densities, respectively equal to
$\frac{p}{q}$, $\frac{p_i}{q}$, with $p$ relatively prime to $q$ and
$\frac{p_i}{q}$ close enough to $\... | 9602042v1 |
1996-06-14 | A new non-Fermi liquid fixed point | We study a new exchange interaction in which the conduction electrons with
pseudo spin $S_c=3/2$ interact with the impurity spin $S_I=1/2$. Due to the
overscreening of the impurity spin by higher conduction electron spin, a new
non-trivial intermediate coupling strength fixed point is realized. Using the
numerical reno... | 9606095v2 |
1996-07-04 | On Metal-Insulator Transitions due to Self-Doping | We investigate the influence of an unoccupied band on the transport
properties of a strongly correlated electron system. For that purpose,
additional orbitals are coupled to a Hubbard model via hybridization. The
filling is one electron per site. Depending on the position of the additional
band, both, a metal--to--insu... | 9607032v1 |
1996-08-26 | Screening effects in superconductors | The partition function of the Hubbard model with local attraction and long
range Coulomb repulsion between electrons is written as a functional integral
with an action $A$ involving a pairing field $\Delta$ and a local potential
$V$. After integration over $V$ and over fluctuations in $|\Delta|^{2}$, the
final form of ... | 9608119v1 |
1996-09-20 | Singlet and triplet doped-hole configurations in La_2Cu_0.5Li_0.5O_4 | The ordered alloy La_2Li_{0.5}Cu_{0.5}O_4 is found to be a band insulator in
local density approximation (LDA) calculations with the unoccupied conduction
band having predominantly d_{x^2-y^2}-symmetry and substantial weight in O
2p-orbitals. This is equivalent to a predominant local singlet configuration
d^9L or a low... | 9609202v1 |
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