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2023-06-09 | Finite-temperature second-order perturbation analysis of magnetocrystalline anisotropy energy of L10-type ordered alloys | We present a novel finite-temperature second-order perturbation method
incorporating spin-orbit coupling to investigate the temperature-dependent
site-resolved contributions to the magnetocrystalline anisotropy energy (MAE),
specifically K1(T), in FePt, MnAl, and FeNi alloys. Our developed method
successfully reproduce... | 2306.05681v1 |
2023-07-11 | Slip intermittency and dwell fatigue in titanium alloys: a discrete dislocation plasticity analysis | Slip intermittency and stress oscillations in titanium alloy Ti-7Al-O that
were observed using in-situ far-field high energy X-ray diffraction microscopy
(ff-HEDM) are investigated using a discrete dislocation plasticity (DDP) model.
The mechanistic foundation of slip intermittency and stress oscillations are
shown to ... | 2307.05316v1 |
2023-08-11 | Observation of broadening Rashba-type band in Au2Sb surface alloy | Here, we report a novel AuSb 2D superstructure on Au(111) that shows
agreements and discrepancies to the expected electronic features of the ideal
2D surface alloys with $\sqrt{3}\times\sqrt{3}$ periodicity. Using spin- and
angle-resolved photoemission spectroscopy, we find a significant spin splitting
of the alloy ban... | 2308.06183v2 |
2023-08-15 | A primitive machine learning tool for the mechanical property prediction of multiple principal element alloys | Multi-principal element alloys (MPEAs) are produced by combining metallic
elements in what is a diverse range of proportions. MPEAs reported to date have
revealed promising performance due to their exceptional mechanical properties.
Training a machine learning (ML) model on known performance data is a
reasonable method... | 2308.07649v1 |
2023-08-24 | Two-dimensional germanium islands with Dirac signature on Ag2Ge surface alloy | Two-dimensional (2D) Dirac materials have attracted intense research efforts
due to their promise for applications ranging from field-effect transistors and
low-power electronics to fault-tolerant quantum computation. One key challenge
is to fabricate 2D Dirac materials hosting Dirac electrons. Here, monolayer
germanen... | 2308.12878v1 |
2023-08-30 | High-throughput assessment of the microstructural stability of segregation-engineered nanocrystalline Al-Ni-Y alloys | Segregation engineering has emerged as a promising pathway towards designing
thermally stable nanocrystalline alloys with enhanced mechanical properties.
However, the compositional and processing space for solute stabilized
microstructures is vast, thus the application of high-throughput techniques to
accelerate optima... | 2308.16174v1 |
2023-09-09 | $g$-factor engineering with InAsSb alloys toward zero band gap limit | Band gap is known as an effective parameter for tuning the Lande $g$-factor
in semiconductors and can be manipulated in a wide range through the bowing
effect in ternary alloys. In this work, using the recently developed virtual
substrate technique, high-quality InAsSb alloys throughout the whole Sb
composition range a... | 2309.04779v1 |
2023-09-20 | Superconductivity in the cobalt-doped V3Si A15 intermetallic compound | The A15 structure of superconductors is a prototypical type-II superconductor
that has generated considerable interest since the early history of
superconducting materials. This paper discusses the superconducting properties
of previously unreported V3-xCoxSi alloys. It is found that the lattice
parameter decreases wit... | 2309.11055v1 |
2023-10-05 | Serrated plastic flow in slowly-deforming complex concentrated alloys: universal signatures of dislocation avalanches | Under plastic flow, multi-element high/medium-entropy alloys (HEAs/MEAs)
commonly exhibit complex intermittent and collective dislocation dynamics owing
to inherent lattice distortion and atomic-level chemical complexities. Using
atomistic simulations, we report on an avalanche study of slowly-driven model
face-centere... | 2310.03828v1 |
2023-10-16 | Theoretical demonstration of the possibility of using binary alloys or solid solutions in ternary systems as geothermometers | The investigation of the processes of mineral deposit formation and their
history is a fundamental task. Solving this task can increase mining efficiency
and make a significant contribution to understanding the formation of the
Earth's crust. The main approach to solving this task is determining the values
of thermodyn... | 2310.10099v1 |
2023-10-17 | Periodic linear complexions: Co-segregation of solutes at a low-angle grain boundary in a magnesium alloy | Solute segregation at low angle grain boundaries (LAGB) in Mg alloys
significantly affects GB energy and mobility, therefore recrystallization
kinetics and corresponding texture modification. In a system featuring multiple
substitutional elements at high local concentration levels, solute-solute
interaction needs to be... | 2310.11084v1 |
2023-10-18 | A New Class of Materials Based on Nanoporous High Entropy Alloys with Outstanding Properties | Nanoporous metals with a random, bicontinuous structure of both pores and
ligaments exhibit many unique mechanical properties, but their technical
applications are often limited by their intrinsic brittleness under tensile
strain triggered by fracture of the weakest ligaments. Here, we use molecular
dynamics simulation... | 2310.11937v1 |
2023-10-18 | Deformation Mechanisms in High Entropy Alloys: A Minireview of Short-Range Order Effects | The complex atomic scale structure of high entropy alloys presents new
opportunities to expand the deformation theories of mechanical metallurgy. In
this regard, solute-defect interactions have emerged as critical piece in
elucidating the operation of deformation mechanisms. While notable progress has
been made in unde... | 2310.12078v1 |
2023-10-19 | Scaling and complexity of stress fluctuations associated with smooth and jerky flow in a FeCoNiTiAl high-entropy alloy | Recent observations of jerky flow in high-entropy alloys (HEA) revealed a
high role of self-organization of dislocations in their plasticity. The present
work reports first results of investigation of stress fluctuations during
plastic deformation of a FeCoNiTiAl alloy, examined in a wide temperature range
covering bot... | 2310.12589v1 |
2023-10-24 | Zr-Co-Al bulk metallic glass composites containing B2 ZrCo via rapid quenching and annealing | As a promising remedy for overcoming the limited ductility and work softening
of bulk metallic glasses (BMGs), BMG composites incorporating a B2 crystalline
phase have attracted considerable attention. Here, we explore the formation of
Zr-Co-Al BMG composites by quenching alloys Zr$_{55}$Co$_{31}$Al$_{14}$,
Zr$_{54.5}$... | 2310.15521v1 |
2023-10-27 | Grain Boundary Segregation Predicted by Quantum-Accurate Segregation Spectra but not by Classical Models | In alloys, solute segregation at grain boundaries is classically attributed
to three driving forces: a high solution enthalpy, a high size mismatch, and a
high difference in interfacial energy. These effects are generally cast into a
single scalar segregation energy and used to predict grain boundary solute
enrichment ... | 2310.18447v2 |
2023-12-04 | Negative Magnetization and Magnetic Ordering of Rare Earth and Transition Metal Sublattices in NdFe0.5Cr0.5O3 | We investigate the effect of alloying at the 3d transition metal site of a
rare-earth-transition metal oxide, by considering NdFe0.5Cr0.5O3 alloy with two
equal and random distribution of 3d ions, Cr and Fe, interacting with an early
4f rare earth ion, Nd. Employing temperature- and field-dependent magnetization
measur... | 2312.01595v1 |
2023-12-21 | Effective Phonon Dispersion of $β$- (Al$_x$Ga$_{1-x}$)$_2$O$_3$ alloy semiconductor | In this work, the Effective Phonon Dispersion of $\beta$-
(Al$_x$Ga$_{1-x}$)$_2$O$_3$ alloy is investigated using the Phonon unfolding
formalism. To capture the true randomness of the system, supercells are
designed using the technique of special quasirandom structues. The phonon
unfolding technique is then used to obt... | 2312.14014v2 |
2023-12-22 | Frustrated metastable-to-equilibrium grain boundary structural transition in NbMoTaW due to segregation and chemical complexity | Grain boundary structural transitions can lead to significant changes in the
properties and performance of materials. In multi-principal element alloys,
understanding these transitions becomes complex due to phenomena such as local
chemical ordering and multi-component segregation. Using atomistic simulations,
we explo... | 2312.14344v2 |
2023-12-29 | Accelerating Process Development for 3D Printing of New Metal Alloys | Addressing the uncertainty and variability in the quality of 3D printed
metals can further the wide spread use of this technology. Process mapping for
new alloys is crucial for determining optimal process parameters that
consistently produce acceptable printing quality. Process mapping is typically
performed by convent... | 2401.00065v1 |
2024-01-05 | Integrated ab initio modelling of atomic order and magnetic anisotropy for rare-earth-free magnet design: effects of alloying additions in $\mathrm{L}1_0$ FeNi | We describe an integrated modelling approach to accelerate the search for
novel, single-phase, multicomponent materials with high magnetocrystalline
anisotropy (MCA). For a given system we predict the nature of atomic ordering,
its dependence on the magnetic state, and then proceed to describe the
consequent MCA. Cruci... | 2401.02809v1 |
2024-01-26 | Accelerated intermetallic phase amorphization in a Mg-based high-entropy alloy powder | High-energy mechanical milling is employed to synthesize a stable
high-entropy alloy powder from an otherwise immiscible Mg-Ti rich metallic
mixture. Predictions from first principles and materials theory corroborate the
results from microscopic characterizations that reveal a transition of the
amorphous phase from a p... | 2401.15197v1 |
2024-02-11 | Langmuir-like model of dilute impurities in concentrated solid solutions | High-entropy alloys have drawn recent interest for their promising mechanical
properties and irradiation resistance. Various properties, namely transport
properties, are controlled by point defect concentration, which must be known
before performing atomistic simulations to compute transport coefficients. In
this work,... | 2402.07324v1 |
2024-02-12 | Chemical inhomogeneities in high-entropy alloys help mitigate the strength-ductility trade-off | Metallurgists have long been accustomed to a trade-off between yield strength
and tensile ductility. Extending previously known strain-hardening mechanisms,
the emerging multi-principal-element alloys (MPEAs) offer additional help in
promoting the strength-ductility synergy, towards gigapascal yield strength
simultaneo... | 2402.07389v1 |
2024-02-14 | Efficient Terahertz Generation from CoPt-based Terahertz Emitters via Orbital-to-Charge Conversion | Orbitronics devices operate by manipulating orbitally-polarized currents.
Recent studies have shown that these orbital currents can be excited by
femtosecond laser pulses in ferromagnet as Ni and converted into ultrafast
charge current via orbital-to-charge conversion. However, the terahertz
emission from orbitronic te... | 2402.09228v1 |
2024-02-29 | Magnetic properties of binary alloys Ni1-xMox and Ni1-yCuy close to critical concentrations | The search for the ferromagnetic quantum critical point (FM QCP) has always
been a captivating research topic in the scientific community. In pursuit of
this goal, we introduced nonmagnetic transition metals to alloy with elemental
nickel, studying the magnetic properties of nickel binary alloys Ni1-xMox and
Ni1-yCuy a... | 2402.18902v1 |
2024-03-08 | Superconductivity of the New Medium-Entropy Alloy V4Ti2W with a Body-Centered Cubic Structure | Medium- and high-entropy alloy (MEA and HEA) superconductors have attracted
considerable interest since their discovery. This paper reports the
superconducting properties of ternary tungsten-containing MEA V4Ti2W for the
first time. V4Ti2W is a type II superconductor with a body-centered cubic (BCC)
structure. Experime... | 2403.05115v1 |
2024-03-10 | Active Learning for Rapid Targeted Synthesis of Compositionally Complex Alloys | The next generation of advanced materials is tending toward increasingly
complex compositions. Synthesizing precise composition is time-consuming and
becomes exponentially demanding with increasing compositional complexity. An
experienced human operator does significantly better than a beginner but still
struggles to c... | 2403.06329v1 |
2024-03-20 | Spontaneous formation of Frenkel defects in high-entropy-alloys-type compound | High-entropy alloys (HEAs) are attracting attention due to their exceptional
properties, such as enhanced mechanical toughness, superconducting robustness,
and thermoelectric performance. Numerous HEAs have been developed for diverse
applications, ranging from self-healing in fusion reactors to addressing
environmental... | 2403.13323v1 |
2024-03-24 | AB5 type multicomponent TiVCoNiMn2 high-entropy alloy | Recent theoretical and practical research has focused on multi-component High
Entropy Alloys (HEAs), which have superior mechanical and functional properties
than standard alloys based on a single major element, thereby establishing a
new field. A multi-component HEA contains five or more primary elements at
concentrat... | 2403.16241v1 |
2024-03-31 | Low-loss liquid metal interconnects for modular superconducting quantum systems | Building modular architecture with superconducting quantum computing chips is
one of the means to achieve qubit scalability, allowing the screening,
selection, replacement, and integration of individual qubit modules into large
quantum systems. However, the non-destructive replacement of modules within a
compact archit... | 2404.00770v1 |
1997-10-21 | Cu-Au, Ag-Au, Cu-Ag and Ni-Au intermetallics: First-principles study of phase diagrams and structures | The classic metallurgical systems -- noble metal alloys -- that have formed
the benchmark for various alloy theories, are revisited. First-principles fully
relaxed general potential LAPW total energies of a few ordered structures are
used as input to a mixed-space cluster expansion calculation to study the phase
stabil... | 9710225v1 |
2010-12-05 | Influence of proteins from physiological solutions on the electrochemical behaviour of the Ti-6Al-4V alloy: reproducibility and time-frequency dependence. ---- Influence de la teneur en protéines de solutions physiologiques sur le comportement électrochimique du Ti-6Al-4V : reproductibilité et représentation temps-fréq... | The electrochemical behaviour of the biomedical and metallic alloys,
especially in the orthopaedic implants fields, raises many questions. This
study is dedicated for studying the Ti-6Al-4V alloy, by electrochemical
impedance spectroscopy, EIS, in various physiological media,: Ringer solution,
phosphate buffered soluti... | 1012.0985v1 |
2011-09-13 | Reentrant superconductivity in superconductor/ferromagnetic-alloy bilayers | We studied the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) like state
establishing due to the proximity effect in superconducting Nb/Cu41Ni59
bilayers. Using a special wedge-type deposition technique, series of 20-35
samples could be fabricated by magnetron sputtering during one run. The layer
thickness of only a few nanom... | 1109.2757v1 |
2013-06-10 | Lattice charge models and core level shifts in disordered alloys | Differences in core level binding energies between atoms belonging to the
same chemical species can be related to differences in their intra- and
extra-atomic charge distributions, and differences in how their core holes are
screened. With this in mind, we consider the charge-excess functional model
(CEFM) for net atom... | 1306.2154v3 |
2014-02-19 | Magnetism of PdNi alloys near the critical concentration for ferromagnetism | We report results of a muon spin rotation and relaxation ($\mu$SR) study of
dilute Pd$_{1-x}$Ni$_x$ alloys, with emphasis on Ni concentrations $x =$ 0.0243
and 0.025. These are close to the critical value $x_\mathrm{cr}$ for the onset
of ferromagnetic long-range order (LRO), which is a candidate for a quantum
critical ... | 1402.4532v1 |
2016-11-16 | Growth of Ni and Ni-Cr Alloy Thin Films on MgO(001): Effect of Alloy Composition on Surface Morphology | The effects of substrate treatment, temperature and composition on the
surface morphology of Ni-Cr thin films grown on MgO(001) are studied by
scanning tunneling microscopy (STM) and atomic force microscopy (AFM). A
combination of acid-etching and high temperature deposition (400C) will result
in smooth films and terra... | 1611.05495v1 |
2018-01-16 | Electronic structure of the Mo$_{1-x}$Re$_x$ alloys studied through resonant photoemission spectroscopy | We have studied the electronic structure of Mo rich Mo$_{1-x}$Re$_x$ alloys
(0$\leq$ x $\leq$0.4) using valence band photoemission spectroscopy in the
photon energy range 23-70 eV and density of states calculations. Comparison of
the photoemission spectra with the density of states calculations suggests that
with respe... | 1801.05087v1 |
2019-11-13 | First principles analysis of electronic structure evolution and the indirect- to direct-gap transition in Ge$_{1-x}$Pb$_{x}$ group-IV alloys | We present a theoretical analysis of electronic structure evolution in the
group-IV alloy Ge$_{1-x}$Pb$_{x}$ based on density functional theory. For
ordered alloy supercells we demonstrate the emergence of a singlet conduction
band (CB) edge state, suggesting the emergence of a direct band gap for Pb
compositions as lo... | 1911.05679v1 |
2018-10-25 | Inhomogeneous magnon scattering during ultrafast demagnetization | Ni$_{0.8}$Fe$_{0.2}$ (Py) and Py alloyed with Cu exhibit intriguing ultrafast
demagnetization behavior, where the Ni magnetic moment shows a delayed response
relative to the Fe, an effect which is strongly enhanced by Cu alloying. We
have studied a broad range of Cu concentrations to elucidate the effects of Cu
alloyin... | 1810.10994v1 |
2019-02-15 | Magnetic states of Ni-Mn-Sn based shape memory alloy: a combined muon spin relaxation and neutron diffraction study | The fascinating multiple magnetic states observed in the Ni-Mn-Sn based
metamagnetic shape memory alloy are addressed through a combined muon spin
relaxation (muSR) and neutron powder diffraction studies. The material used in
the present investigation is an off-stoichiometric alloy of nominal
composition, Ni[2.04]Mn[1.... | 1902.05749v1 |
2022-02-25 | TiFe$_{0.85}$Mn$_{0.05}$ alloy produced at industrial level for a hydrogen storage plant | In the use of hydrogen as large-scale energy vector, metal hydrides based on
intermetallic compounds play a key role, thanks to mild temperatures and
pressures required for the storage. It is increasingly necessary to develop
hydrogen-based devices, and in this work, the intermetallic compound
TiFe$_{0.85}$Mn$_{0.05}$ ... | 2202.12753v1 |
2020-12-02 | Strain-Rate-Dependent Deformation Behavior of Ti29Zr24Nb23Hf24 High Entropy Alloys at Elevated and Room Temperature | We investigate the strain-rate-dependent mechanical behavior and deformation
mechanisms of a refractory high entropy alloy, Ti29Zr24Nb23Hf24 (at.%), with a
single-phase body-centered cubic (BCC) structure. High-temperature compression
tests were conducted at temperatures from 700 to 1100{\deg}C at strain rates
ranging ... | 2012.00954v1 |
2021-04-28 | Structural transformation and magnetic properties of (Fe$_{0.7}$Co$_{0.3}$)$_2$B alloys doped with 5$d$ elements: A combined first-principles and experimental study | (Fe,Co)$_2$B-based compounds with specified 5$d$ substitutions are considered
as promising materials for permanent magnets without rare-earth elements. We
conducted a combined first-principles and experimental study focused on
(Fe$_{0.7}$Co$_{0.3}$)$_2$B alloys doped with W and Re. First, we used
full-potential local-o... | 2104.13724v2 |
2021-05-17 | The influence of beam focus during laser powder bed fusion of a high reflectivity aluminium alloy -- AlSi$_{10}$Mg | LPBF of Al alloys is associated with numerous challenges when compared to
other commonly used alloys due to their higher reflectivity and thermal
conductivity. In this work, processing diagrams, temperature prediction models,
XCT, and metallography are used for establishing criteria in process parameter
optimization of... | 2105.07920v3 |
2021-06-11 | Stacking fault energy induced softening in the nucleation limited plasticity regime: a molecular dynamics study on Cu-Al alloys | In general, with the addition of solutes, the yield strength of alloys is
expected to increase and this phenomenon is known as solid solution
strengthening. However, reports on the ``anomalous'' softening with alloying
additions are not uncommon; for example, it is known that the heterogeneous
nucleation of dislocation... | 2106.06557v1 |
2022-04-29 | Phase-Field Modeling of Coupled Brittle-Ductile Fracture in Aluminum Alloys | Fracture in aluminum alloys with precipitates involves at least two
mechanisms, namely, ductile fracture of the aluminum-rich matrix and brittle
fracture of the precipitates. In this work, a coupled crystal plasticity-phase
field model for mixed ductile-brittle failure modes is formulated and used to
investigate the ef... | 2204.13994v1 |
2022-05-16 | Thermal super-jogs control high-temperature strength in Nb-Mo-Ta-W alloys | Refractory multi-element alloys (RMEA) with body-centered cubic (bcc)
structure have been the object of much research over the last decade due to
their high potential as candidate materials for high-temperature applications.
Most of these alloys display a remarkable strength at high temperatures, which
cannot be explai... | 2205.07413v1 |
2022-06-06 | Mechanism of Local Lattice Distortion Effects on Vacancy Migration Barriers in FCC Alloys | Accurate prediction of vacancy migration energy barriers, $\Delta E_a$, in
multi-component alloys is extremely challenging yet critical for the
development of diffusional transformation kinetics needed to model alloy
behavior in many technological applications. Here, results from $\Delta E_a$
and the energy driving for... | 2206.02879v1 |
2022-09-23 | Impact of random alloy fluctuations on the carrier distribution in multi-color (In,Ga)N/GaN quantum well systems | In this work, we study the impact that random alloy fluctuations have on the
distribution of electrons and holes across the active region of a (In,Ga)N/GaN
multi-quantum well based light emitting diode (LED). To do so, an atomistic
tight-binding model is employed to account for alloy fluctuations on a
microscopic level... | 2209.11657v1 |
2022-10-26 | Modeling of dendritic solidification and numerical analysis of the phase-field approach to model complex morphologies in alloys | Dendrites are one of the most widely observed patterns in nature and occur
across a wide spectrum of physical phenomena. In solidification and growth
patterns in metals and crystals, the multi-level branching structures of
dendrites pose a modeling challenge, and a full resolution of these structures
is computationally... | 2210.14449v2 |
2022-12-06 | Unidirectional Rashba Spin Splitting in Single Layer WS$_{2(1-x)}$Se$_{2x}$ alloy | Atomically thin two-dimensional (2D) layered semiconductors such as
transition metal dichalcogenides (TMDs) have attracted considerable attention
due to their tunable band gap, intriguing spin-valley physics, piezoelectric
effects and potential device applications. Here we study the electronic
properties of a single la... | 2212.03248v1 |
2022-12-07 | Orientation dependent pinning of (sub)grains by dispersoids during recovery and recrystallization in an Al-Mn alloy | The recrystallized grain size and texture in alloys can be controlled via the
microchemistry state during thermomechanical processing. The influence of
concurrent precipitation on recovery and recrystallization is here analyzed by
directly correlating (sub)grains of P, CubeND or Cube orientation with
second-phase parti... | 2212.03527v1 |
2023-06-02 | The phase stability of large-size nanoparticle alloy catalysts at ab initio quality using a nearsighted force-training approach | CoPt nanoparticle catalysts are integral to commercial fuel cells. Such
systems are prohibitive to fully characterize with electronic structure
calculations. Machine-learned potentials offer a scalable solution; however,
such potentials are only reliable if representative training data can be
employed, which typically ... | 2306.01846v2 |
2023-06-07 | Emergent Magnetic Phases and Piezomagnetic Effects in Mn$_x$Ni$_{1-x}$F$_2$ Thin Film Alloys | The effect of random competing single-ion anisotropies in antiferromagnets
was studied using epitaxial Mn$_x$Ni$_{1-x}$F$_2$ antiferromagnetic thin film
alloys grown via molecular beam epitaxy. The crystal structure of this material
is tetragonal for all values of $x$, and the Mn sites have a magnetic easy axis
single-... | 2306.04809v2 |
2023-08-29 | Sulfur Vacancy Related Optical Transitions in Graded Alloys of MoxW1-xS2 Monolayers | Engineering the electronic bandgap is of utmost importance in diverse domains
ranging from information processing and communication technology to sensing and
renewable energy applications. Transition metal dichalcogenides (TMDCs) provide
an ideal platform for achieving this goal through techniques including
alloying, d... | 2308.14990v1 |
2024-04-11 | Tunneling magnetoresistance in MgO tunnel junctions with Fe-based leads in empirically corrected density functional theory | The minority-spin Fe/MgO interface states are at the Fermi level in density
functional theory (DFT), but experimental evidence and GW calculations place
them slightly higher in energy. This small shift can strongly influence
tunneling magnetoresistance (TMR) in junctions with a thin MgO barrier and its
dependence on th... | 2404.08103v1 |
1998-01-28 | Electronic Structure, Local Moments and Transport in Fe_2VAl | Local spin density approximation calculations are used to elucidate
electronic and magnetic properties of Heusler structure Fe_2VAl. The compound
is found to be a low carrier density semimetal. The Fermi surface has small
hole pockets derived from a triply degenerate Fe derived state at Gamma
compensated by an V derive... | 9801302v1 |
2002-05-29 | Magnetic fluctuations and superconductivity in YbPd$_2$Sn | We report muon spin relaxation and inelastic neutron measurements on the
Heusler system YbPd$_2$Sn. Localised anisotropic and quasi-elastic Yb magnetic
fluctuations are observed below $T = 150$K. Both $\mu$SR and neutron data
indicate a slowing-down of the spin-fluctuations, upon lowering the
temperature, similar to th... | 0205617v2 |
2003-10-16 | Magnetotransport in Single Crystal Half-Heusler Compounds | We present the results of electrical resistivity and Hall effect measurements
on single crystals of HfNiSn, TiPtSn, and TiNiSn. Semiconducting behavior is
observed in each case, involving the transport of a small number of highly
compensated carriers. Magnetization measurements suggest that impurities and
site disorder... | 0310369v2 |
2005-11-18 | Half-metallic ferromagnetism with high magnetic moment and high Curie temperature in Co$_2$FeSi | Co$_2$FeSi crystallizes in the ordered L2$_1$ structure as proved by X-ray
diffraction and M\"o\ss bauer spectroscopy. The magnetic moment of Co$_2$FeSi
was measured to be about $6\mu_B$ at 5K. Magnetic circular dichroism spectra
excited by soft X-rays (XMCD) were taken to determine the element specific
magnetic moment... | 0511463v1 |
2006-06-26 | Epitaxial film growth and magnetic properties of Co_2FeSi | We have grown thin films of the Heusler compound Co_2FeSi by RF magnetron
sputtering. On (100)-oriented MgO substrates we find fully epitaxial
(100)-oriented and L2_1 ordered growth. On Al_2O_3 (11-20) substrates, the film
growth is (110)-oriented, and several in-plane epitaxial domains are observed.
The temperature de... | 0606666v2 |
2006-09-25 | Ion beam induced modification of exchange interaction and spin-orbit coupling in the Co$_2$FeSi Heusler compound | A Co$_2$FeSi (CFS) film with L2$_1$ structure was irradiated with different
fluences of 30 keV Ga$^+$ ions. Structural modifications were subsequently
studied using the longitudinal (LMOKE) and quadratic (QMOKE) magneto-optical
Kerr effect. Both the coercivity and the LMOKE amplitude were found to show a
similar behavi... | 0609633v2 |
2006-09-27 | Huge quadratic magneto-optical Kerr effect and magnetization reversal in the Co$_2$FeSi Heusler compound | Co$_2$FeSi(100) films with L2$_1$ structure deposited onto MgO(100) were
studied exploiting both longitudinal (LMOKE) and quadratic (QMOKE)
magneto-optical Kerr effect. The films exhibit a huge QMOKE signal with a
maximum contribution of up to 30 mdeg, which is the largest QMOKE signal in
reflection that has been measu... | 0609688v2 |
2006-12-04 | Structural, magnetic, and transport properties of Co$_2$FeSi Heusler films | We report the deposition of thin Co$_2$FeSi films by RF magnetron sputtering.
Epitaxial (100)-oriented and L2$_1$ ordered growth is observed for films grown
on MgO(100) substrates. (110)-oriented films on Al$_2$O$_3$(110) show several
epitaxial domains in the film plane. Investigation of the magnetic properties
reveals... | 0612073v1 |
1998-10-07 | Towards a classification of static electro-vacuum space-times containing an asymptotically flat spacelike hypersurface with compact interior | We show that static electro-vacuum black hole space-times containing an
asymptotically flat spacelike hypersurface with compact interior and with both
degenerate and non-degenerate components of the event horizon do not exist,
under the supplementary hypothesis that all degenerate components of the event
horizon have c... | 9810022v3 |
2002-10-08 | On "time-periodic" black-hole solutions to certain spherically symmetric Einstein-matter systems | This paper explores ``black hole'' solutions of various Einstein-wave matter
systems admitting an isometry of their domain of outer communications taking
every point to its future. In the first two parts, it is shown that such
solutions, assuming in addition that they are spherically symmetric and the
matter has a cert... | 0210025v1 |
1996-05-13 | Cosmological Analogues of the Bartnik--McKinnon Solutions | We present a numerical classification of the spherically symmetric, static
solutions to the Einstein--Yang--Mills equations with cosmological constant
$\Lambda$. We find three qualitatively different classes of configurations,
where the solutions in each class are characterized by the value of $\Lambda$
and the number ... | 9605089v1 |
1996-05-22 | Stability Analysis of New Solutions of the EYM system with Cosmological Constant | We analyze the stability properties of the purely magnetic, static solutions
to the Einstein--Yang--Mills equations with cosmological constant. It is shown
that all three classes of solutions found in a recent study are unstable under
spherical perturbations. Specifically, we argue that the configurations have
$n$ unst... | 9605166v1 |
2002-06-14 | Statistics of Self-Crossings and Avoided Crossings of Periodic Orbits in the Hadamard-Gutzwiller Model | Employing symbolic dynamics for geodesic motion on the tesselated
pseudosphere, the so-called Hadamard-Gutzwiller model, we construct extremely
long periodic orbits without compromising accuracy. We establish criteria for
such long orbits to behave ergodically and to yield reliable statistics for
self-crossings and avo... | 0206023v1 |
2003-09-05 | Universal spectral form factor for chaotic dynamics | We consider the semiclassical limit of the spectral form factor $K(\tau)$ of
fully chaotic dynamics. Starting from the Gutzwiller type double sum over
classical periodic orbits we set out to recover the universal behavior
predicted by random-matrix theory, both for dynamics with and without time
reversal invariance. Fo... | 0309022v1 |
2004-01-15 | Semiclassical Foundation of Universality in Quantum Chaos | We sketch the semiclassical core of a proof of the so-called
Bohigas-Giannoni-Schmit conjecture: A dynamical system with full classical
chaos has a quantum energy spectrum with universal fluctuations on the scale of
the mean level spacing. We show how in the semiclassical limit all system
specific properties fade away,... | 0401021v2 |
2005-03-23 | Periodic-Orbit Theory of Universality in Quantum Chaos | We argue semiclassically, on the basis of Gutzwiller's periodic-orbit theory,
that full classical chaos is paralleled by quantum energy spectra with
universal spectral statistics, in agreement with random-matrix theory. For
dynamics from all three Wigner-Dyson symmetry classes, we calculate the
small-time spectral form... | 0503052v1 |
2008-04-17 | Electronic Structures of Fe$_{3-x}V$_x$Si Probed by Photoemission Spectroscopy | The electronic structures of the Heusler type compounds Fe$_{3-x}V$_x$Si in
the concentration range between x = 0 and x = 1 have been probed by
photoemission spectroscopy (PES). The observed shift of Si 2p core- level and
the main valence band structres indicate a chemical potential shift to higher
energy with increasi... | 0804.2712v1 |
2008-09-18 | Improvement of structural, electronic, and magnetic properties of Co$_2$MnSi thin films by He$^+$-irradiation | The influence of 30 keV He$^+$ ion irradiation on structural, electronic and
magnetic properties of Co$_2$MnSi thin films with B2 order was investigated. It
was found, that irradiation with light ions can improve the local chemical
order. This provokes changes of the electronic structure and element-specific
magnetizat... | 0809.3192v1 |
2008-10-05 | Brillouin light scattering study of Co$_{2}$Cr$_{0.6}$Fe$_{0.4}$Al and Co$_{2}$FeAl Heusler compounds | The thermal magnonic spectra of Co$_{2}$Cr$_{0.6}$Fe$_{0.4}$Al (CCFA) and
Co$_2$FeAl were investigated using Brillouin light scattering spectroscopy
(BLS). For CCFA, the exchange constant A (exchange stiffness D) is found to be
0.48 $\mu$erg/cm (203 meV A$^2$), while for Co$_2$FeAl the corresponding values
of 1.55 $\mu... | 0810.0838v2 |
2009-06-10 | Periodic-orbit theory of universal level correlations in quantum chaos | Using Gutzwiller's semiclassical periodic-orbit theory we demonstrate
universal behaviour of the two-point correlator of the density of levels for
quantum systems whose classical limit is fully chaotic. We go beyond previous
work in establishing the full correlator such that its Fourier transform, the
spectral form fac... | 0906.1960v2 |
2009-06-26 | Near action-degenerate periodic-orbit bunches: A skeleton of chaos | Long periodic orbits of hyperbolic dynamics do not exist as independent
individuals but rather come in closely packed bunches. Under weak resolution a
bunch looks like a single orbit in configuration space, but close inspection
reveals topological orbit-to-orbit differences. The construction principle of
bunches involv... | 0906.4930v1 |
2009-11-03 | Seebeck coefficients of half-metallic ferromagnets | In this report the Co2 based Heusler compounds are discussed as potential
materials for spin voltage generation. The compounds were synthesized by
arcmelting and consequent annealing. Band structure calculations were performed
and revealed the compounds to be half-metallic ferromagnets. Magnetometry was
performed on th... | 0911.0553v1 |
2010-10-27 | Electronic structure of fully epitaxial Co2TiSn thin films | In this article we report on the properties of thin films of the full Heusler
compound Co2TiSn prepared by DC magnetron co-sputtering. Fully epitaxial,
stoichiometric films were obtained by deposition on MgO (001) substrates at
substrate temperatures above 600{\deg}C. The films are well ordered in the L21
structure, an... | 1010.5754v1 |
2010-11-11 | Influence of tetragonal distortion on the magnetic and electronic properties of the Heusler compound Co2TiSn from first principles | Using the full potential linearized augmented plane wave plus local orbitals
method we determine ab-initio the lattice parameters of tetragonally distorted
Co2TiSn in the L21 structure. The tetragonal lattice parameter c is determined
as a function of the lattice parameter a by energy minimization. The change in
total ... | 1011.2657v1 |
2010-12-14 | Scaling behavior of the spin pumping effect in ferromagnet/platinum bilayers | We systematically measured the DC voltage V_ISH induced by spin pumping
together with the inverse spin Hall effect in ferromagnet/platinum bilayer
films. In all our samples, comprising ferromagnetic 3d transition metals,
Heusler compounds, ferrite spinel oxides, and magnetic semiconductors, V_ISH
invariably has the sam... | 1012.3017v2 |
2010-12-15 | Exchange interactions and Curie temperatures in Mn2CoZ compounds | The generalized Heusler compounds Mn2CoZ (Z = Al, Ga, In, Si, Ge, Sn, Sb)
with the Hg2CuTi structure are of large interest due to their half-metallic
ferrimagnetism. The complex magnetic interactions between the constituents are
studied by first principles calculations of the Heisenberg exchange coupling
parameters, an... | 1012.3261v1 |
2011-01-06 | Metallic surface electronic state in half-Heusler compounds RPtBi (R = Lu, Dy, Gd) | Rare-earth platinum bismuth (RPtBi) has been recently proposed to be a
potential topological insulator. In this paper we present measurements of the
metallic surface electronic structure in three members of this family, using
angle resolved photoemission spectroscopy (ARPES). Our data shows clear
spin-orbit splitting o... | 1101.1261v1 |
2011-01-31 | Ferrimagnetism and disorder in epitaxial Mn(2-x)Co(x)VAl thin films | The quaternary full Heusler compound Mn(2-x)Co(x)VAl with x = 1 is predicted
to be a half-metallic antiferromagnet. Thin films of the quaternary compounds
with x = 0...2 were prepared by DC and RF magnetron co-sputtering on heated MgO
(001) substrates. The magnetic structure was examined by x-ray magnetic
circular dich... | 1101.5994v1 |
2011-06-19 | Magnetic and transport properties of rare-earth-based half-Heusler phases RPdBi: prospective systems for topological quantum phenomena | RPdBi (R = Er, Ho, Gd, Dy, Y, Nd) compounds were studied by means of x-ray
diffraction, magnetic susceptibility, electrical resistivity,
magnetoresistivity, thermoelectric power and Hall effect measurements,
performed in the temperature range 1.5-300 K and in magnetic fields up to 12 T.
These ternaries, except diamagne... | 1106.3763v1 |
2011-09-05 | Superconductivity in the topological semimetal YPtBi | The noncentrosymmetric Half Heusler compound YPtBi exhibits superconductivity
below a critical temperature T_c = 0.77 K with a zero-temperature upper
critical field H_c2(0) = 1.5 T. Magnetoresistance and Hall measurements support
theoretical predictions that this material is a topologically nontrivial
semimetal having ... | 1109.0979v2 |
2011-09-16 | Magnetic order in GdBiPt studied by x-ray resonant magnetic scattering | Rare earth (R) half-Heusler compounds, RBiPt, exhibit a wide spectrum of
novel ground states. Recently, GdBiPt has been proposed as a potential
antiferromagnetic topological insulator (AFTI). We have employed x-ray resonant
magnetic scattering to elucidate the microscopic details of the magnetic
structure in GdBiPt bel... | 1109.3521v1 |
2011-11-04 | Electronic structure and symmetry of valence states of epitaxial NiTiSn and NiZr$_{0.5}$Hf$_{0.5}$Sn thin films by hard x-ray photoelectron spectroscopy | The electronic band structure of thin films and superlattices made of Heusler
compounds with NiTiSn and NiZr$_{0.5}$Hf$_{0.5}$Sn composition was studied by
means of polarization dependent hard x-ray photoelectron spectroscopy. The
linear dichroism allowed to distinguish the symmetry of the valence states of
the differe... | 1111.1031v1 |
2012-07-11 | Optical floating zone growth of high-quality Cu2MnAl single crystals | We report the growth of large single-crystals of Cu2MnAl, a ferromagnetic
Heusler compound suitable for polarizing neutron monochromators, by means of
optical floating zone under ultra-high vacuum compatible conditions. Unlike
Bridgman or Czochralsky grown Cu2MnAl, our floating zone grown single-crystals
show highly re... | 1207.2803v1 |
2012-10-10 | Negative spin polarization of Mn2VGa probed by tunnel magnetoresistance | The ferrimagnetic Heusler compound Mn2VGa is predicted to have a pseudogap in
the majority spin channel, which should lead to a negative tunnel
magnetoresistance. We synthesized epitaxial Mn2VGa thin films on MgO(001)
substrates by dc and rf magnetron co-sputtering, resulting in nearly
stoichiometric films. XRD analysi... | 1210.2966v1 |
2012-11-12 | Magnetic and transport properties of tetragonal- or cubic-Heusler-type Co-substituted Mn-Ga epitaxial thin films | The composition dependence of the structural, magnetic, and transport
properties of epitaxially grown Mn-Co-Ga films were investigated. The crystal
structure was observed to change from tetragonal to cubic as the Co content was
increased. In terms of the dependence of saturation magnetization on the Co
content, relativ... | 1211.2524v1 |
2013-02-21 | Large zero-field cooled exchange-bias in bulk Mn2PtGa | We report a large exchange-bias (EB) effect after zero-field cooling the new
tetragonal Heusler compound Mn2PtGa from the paramagnetic state. The
first-principle calculation and the magnetic measurements reveal that Mn2PtGa
orders ferrimagnetically with some ferromagnetic (FM) inclusions. We show that
ferrimagnetic (FI... | 1302.5229v1 |
2013-03-14 | Thermal Stability and Electrical Control of Magnetization of Heusler/Oxide Interface and Non-collinear Spin Transport of Its Junction | Towards next-generation spintronics devices, such as computer memories and
logic chips, it is necessary to satisfy high thermal stability, low-power
consumption and high spin-polarization simultaneously. Here, from
first-principles, we investigate thermal stability (both structure and
magnetization) and the electric fi... | 1303.3473v2 |
2013-04-22 | Giant enhancement of spin pumping efficiency using Fe3Si ferromagnet | Spincurrentronics, which involves the generation, propagation and control of
spin currents, has attracted a great deal of attention because of the
possibility of realizing dissipation-free information propagation. Whereas
electrical generation of spin currents originally made the field of
spincurrentronics possible, an... | 1304.5890v1 |
2013-09-25 | Ab-initio calculation of the effective on-site Coulomb interaction parameters for half-metallic magnets | Correlation effects play an important role in the electronic structure of
half-metallic (HM) magnets. In particular, they give rise to non-quasiparticle
states above (or below) the Fermi energy at finite temperatures that reduce the
spin polarization and, as a consequence, the efficiency of spintronics devices.
Employi... | 1309.6657v1 |
2013-11-26 | Large enhancement in the generation efficiency of pure spin currents in Ge using Heusler-compound Co_2FeSi electrodes | We show nonlocal spin transport in n-Ge based lateral spin-valve devices with
highly ordered Co_2FeSi/n^+-Ge Schottky tunnel contacts. Clear spin-valve
signals and Hanle-effect curves are demonstrated at low temperatures,
indicating generation, manipulation, and detection of pure spin currents in
n-Ge. The obtained spi... | 1311.6601v1 |
2014-01-25 | Investigation of thermoelectric properties of half-metallic Co2 MnGe by using first principles calculations | By combining the electronic structures obtained from first principles
calculations with Boltzmann transport theory we have investigated the
electronic, magnetic and transport properties of Co$_{2}$MnGe Heusler compound.
The density of states plots, dispersion curves and total energy of paramagnetic
and ferromagnetic (F... | 1401.6511v2 |
2014-10-02 | Investigation of the temperature-dependence of ferromagnetic resonance and spin waves in Co2FeAl0.5Si0.5 | Co2FeAl0.5Si0.5 (CFAS) is a Heusler compound that is of interest for
spintronics applications, due to its high spin polarization and relatively low
Gilbert damping constant. In this study, the behavior of ferromagnetic
resonance as a function of temperature was investigated in CFAS, yielding a
decreasing trend of dampi... | 1410.0439v1 |
2014-12-07 | Prediction and accelerated laboratory discovery of previously unknown 18-electron ABX compounds | Chemists and material scientists have often focused on the properties of
previously reported compounds, leaving out numerous unreported but chemically
plausible compounds that could have interesting properties. For example, the
18-valence electron ABX family of compounds includes the half-Heusler subgroup,
and features... | 1412.2398v1 |
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