publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2009-10-23 | Fast-ion conduction and flexibility and rigidity of solid electrolyte glasses | Electrical conductivity of dry, slow cooled (AgPO$_3$)$_{1-x}$(AgI)$_x$
glasses is examined as a function of temperature, frequency and glass
composition. From these data compositional trends in activation energy for
conductivity E$_A$(x), Coulomb energy E$_c$(x) for Ag$^+$ ion creation,
Kohlrausch stretched exponent $... | 0910.4508v1 |
2009-11-30 | Mg/Ti multilayers: structural, optical and hydrogen absorption properties | Mg-Ti alloys have uncommon optical and hydrogen absorbing properties,
originating from a "spinodal-like" microstructure with a small degree of
chemical short-range order in the atoms distribution. In the present study we
artificially engineer short-range order by depositing Pd-capped Mg/Ti
multilayers with different pe... | 0911.5666v1 |
2010-01-26 | Structure and giant magnetoresistance of granular Co-Cu nanolayers prepared by cross-beam PLD | A series of Co_xCu_{100-x} (x = 0, 40...75, 100) layers with thicknesses
in-between 13 nm and 55 nm were prepared on silicon substrates using cross-beam
pulsed laser deposition. Wide-angle X-ray diffraction (WAXRD), transmission
electron microscopy (TEM) and electrical transport measurements revealed a
structure consis... | 1001.4725v2 |
2010-01-28 | A simple kinetic sensor to structural transitions | Driven non-equilibrium structural phase transformation has been probed using
time varying resistance fluctuations or noise. We demonstrate that the
non-Gaussian component (NGC) of noise obtained by evaluating the higher order
statistics of fluctuations, serves as a simple kinetic detector of these phase
transitions. Us... | 1001.5137v1 |
2010-02-17 | Measurement of Gilbert damping parameters in nanoscale CPP-GMR spin-valves | In-situ, device level measurement of thermal mag-noise spectral linewidths in
60nm diameter CPP-GMR spin-valve stacks of IrMn/ref/Cu/free, with reference and
free layer of similar CoFe/CoFeGe alloy, are used to simultaneously determine
the intrinsic Gilbert damping for both magnetic layers. It is shown that
careful ali... | 1002.3295v1 |
2010-03-06 | From Graphene to Bismuth Telluride: Mechanical Exfoliation of Quasi-2D Crystals for Applications in Thermoelectrics and Topological Insulators | Bismuth telluride (Bi2Te3) and its alloys are the best bulk thermoelectric
materials known today. The stacked quasi-two-dimensional (2D) layers of Bi2Te3
were also identified as topological insulators. In this paper we describe a
method for graphene-inspired exfoliation of crystalline bismuth telluride films
with a thi... | 1003.1398v1 |
2010-06-04 | Electronic structure and the glass transition in pnictide and chalcogenide semiconductor alloys. Part II: The intrinsic electronic midgap states | We propose a structural model that treats in a unified fashion both the
atomic motions and electronic excitations in quenched melts of pnictide and
chalcogenide semiconductors. In Part I (submitted to J. Chem. Phys.), we argued
these quenched melts represent aperiodic $pp\sigma$-networks that are highly
stable and, at ... | 1006.0776v2 |
2010-07-15 | First-principles data for solid-solution strengthening of magnesium: From geometry and chemistry to properties | Solid-solution strengthening results from solutes impeding the glide of
dislocations. Existing theories of strength rely on solute-dislocation
interactions, but do not consider dislocation core structures, which need an
accurate treatment of chemical bonding. Here, we focus on strengthening of Mg,
the lightest of all s... | 1007.2585v1 |
2010-10-09 | Phase field model for coupled displacive and diffusive microstructural processes under thermal loading | A non-isothermal phase field model that captures both displacive and
diffusive phase transformations in a unified framework is presented. The model
is developed in a formal thermodynamic setting, which provides guidance on
admissible constitutive relationships and on the coupling of the numerous
physical processes that... | 1010.1871v2 |
2010-10-22 | Noisy Kondo impurities | The anti-ferromagnetic coupling of a magnetic impurity carrying a spin with
the conduction electrons spins of a host metal is the basic mechanism
responsible for the increase of the resistance of an alloy such as
Cu${}_{0.998}$Fe${}_{0.002}$ at low temperature, as originally suggested by
Kondo . This coupling has emerg... | 1010.4815v1 |
2010-11-06 | Ab-initio study of the bandgap engineering of Al(1-x)Ga(x)N for optoelectronic applications | A theoretical study of Al(1-x)Ga(x)N, based on full-potential linearized
augmented plane wave method, is used to investigate the variations in the
bandgap, optical properties and non-linear behavior of the compound with the
variation of Ga concentration. It is found that the bandgap decreases with the
increase of Ga in... | 1011.1573v1 |
2010-11-13 | Fabrication and characterization of a Ni-Mn-Ga uniaxially textured freestanding film deposited by DC magnetron sputtering | Homogeneous freestanding films have been obtained by the direct current (DC)
magnetron sputtering technique using a sacrificial layer. After annealing, the
films are crystallized with a strong out-of-plane texture along the (022)
direction. The stoichiometry of the annealed films is close to the target
composition and ... | 1011.3109v1 |
2010-11-15 | Critical behavior of ferromagnetic pure and random diluted nanoparticles with competing interactions: variational and Monte Carlo approaches | The magnetic properties and critical behavior of both ferromagnetic pure and
metallic nanoparticles having concurrently atomic disorder, dilution and
competing interactions, are studied in the framework of an Ising model. We have
used both the free energy variational principle based on the Bogoliubov
inequality and Mon... | 1011.3388v1 |
2010-12-15 | Non-collinear magnetism in freestanding and supported monatomic Mn chains | Using first-principles calculations, we study the occurrence of non-collinear
magnetic order in monatomic Mn chains. First, we focus on freestanding Mn
chains and demonstrate that they exhibit a pronounced non-collinear ground
state in a large range of interatomic distances between atoms in the chain. By
artificially v... | 1012.3413v2 |
2010-12-17 | Modulated Martensite: Why it forms and why it deforms easily | Diffusionless phase transitions are at the core of the multifunctionality of
(magnetic) shape memory alloys, ferroelectrics and multiferroics. Giant strain
effects under external fields are obtained in low symmetric modulated
martensitic phases. We outline the origin of modulated phases, their connection
with tetragona... | 1012.3914v2 |
2011-03-05 | Physics and measurements of magnetic materials | Magnetic materials, both hard and soft, are used extensively in several
components of particle accelerators. Magnetically soft iron-nickel alloys are
used as shields for the vacuum chambers of accelerator injection and extraction
septa; Fe-based material is widely employed for cores of accelerator and
experiment magnet... | 1103.1069v1 |
2011-05-13 | First Principles Calculations of Defects in Unstable Crystals: Austenitic Iron | First principles calculations have given a new insight into the energies of
point defects in many different materials, information which cannot be readily
obtained from experiment. Most such calculation are done at zero Kelvin, with
the assumption that finite temperature effects on defect energies and barriers
are smal... | 1105.2663v1 |
2011-05-26 | Prediction of thermal cross-slip stress in magnesium alloys from direct first principles data | We develop a first-principles model of thermally-activated cross-slip in
magnesium in the presence of a random solute distribution. Electronic structure
methods provide data for the interaction of solutes with prismatic dislocation
cores and basal dislocation cores. Direct calculations of interaction energies
are possi... | 1105.5365v1 |
2011-06-01 | Enhancement-mode buried strained silicon channel quantum dot with tunable lateral geometry | We propose and demonstrate a relaxed-SiGe/strained-Si (SiGe/s-Si)
enhancement-mode gate stack for quantum dots. The enhancement-mode SiGe/s-Si
structure is pursued because it spaces the quantum dot away from charge and
spin defect rich dielectric interfaces and minimizes background dopants. A
mobility of 1.6\times10^5 ... | 1106.0337v1 |
2011-06-03 | Spectrum standardization for laser-induced breakdown spectroscopy measurements | This paper presents a spectra normalization method for laser-induced
breakdown spectroscopy (LIBS) measurements by converting the recorded
characteristic line intensity at varying conditions to the intensity under a
standard condition with standard plasma temperature, degree of ionization, and
total number density of t... | 1106.0583v1 |
2011-06-28 | An effective medium approach to the asymptotics of the statistical moments of the parabolic Anderson model and Lifshitz tails | Originally introduced in solid state physics to model amorphous materials and
alloys exhibiting disorder induced metal-insulator transitions, the Anderson
model $H_{\omega}= -\Delta + V_{\omega} $ on $l^2(\bZ^d)$ has become in
mathematical physics as well as in probability theory a paradigmatic example
for the relevanc... | 1106.5728v1 |
2011-08-01 | Theoretical study of magnetic properties and hyperfine interactions in $σ$-FeV alloys | Electronic structure Korringa-Kohn-Rostoker calculations for the
$\sigma$-phase in Fe$_{100-x}$V$_x$ were performed in compositional range of
its occurance ($\sim 34 \le x \le \sim 65$). Fe and V magnetic moments and
hyperfine fields were determined for five inequivalent lattice sites in two
models of magnetic structur... | 1108.0278v1 |
2011-08-19 | Structure and magnetic properties of nanostructured Pd-Fe thin films produced by pulse electrodeposition | Nanostructured Pd-Fe thin films with varied Fe content were prepared by
electrodeposition technique from organic electrolytes on Cu and brass
substrates. The structure and the magnetic properties of the films were
investigated prior to post-deposition annealing. The structure of the Pd1-xFex
thin films with x = 0.14, 0... | 1108.3888v1 |
2011-09-08 | Low-temperature structure of xi'-Al-Pd-Mn optimized by ab-initio methods | We have studied and resolved occupancy correlations in the existing average
structure model of the complex metallic alloy xi'-Al-Pd-Mn [Boudard et al.,
Phil. Mag. A, 74, 939 (1996)], which has approximately 320 atoms in the unit
cell and many fractionally occupied sites. Model variants were constructed
systematically i... | 1109.1687v2 |
2011-09-15 | Characterization of Thin Pixel Sensor Modules Interconnected with SLID Technology Irradiated to a Fluence of 2$\cdot 10^{15}$\,n$_{\mathrm{eq}}$/cm$^2$ | A new module concept for future ATLAS pixel detector upgrades is presented,
where thin n-in-p silicon sensors are connected to the front-end chip
exploiting the novel Solid Liquid Interdiffusion technique (SLID) and the
signals are read out via Inter Chip Vias (ICV) etched through the front-end.
This should serve as a ... | 1109.3299v2 |
2011-10-12 | First-principles study of magnetism, structure and chemical order in small FeRh alloy clusters | The structural, electronic and magnetic properties of small ${\rm Fe}_m {\rm
Rh}_n$ clusters having $N = m+n \leq 8$ atoms are studied in the framework of a
generalized-gradient approximation to density-functional theory. The
correlation between structure, chemical order, and magnetic behavior is
analyzed as a function... | 1110.2669v1 |
2011-12-02 | Structural and optical studies of FeSb2 under high pressure | Nanostructured orthorhombic FeSb2 and an amorphous phase were formed by
mechanical alloying starting from a mixture of high purity elemental Fe and Sb
powders. The effects of high pressures on structural and optical properties
were studied using X-ray diffraction (XRD) and Raman spectroscopy (RS). XRD
patterns showed t... | 1112.0468v1 |
2011-12-19 | Quantum-Hall plateau-plateau transition in top-gated epitaxial graphene grown on SiC (0001) | We investigate the low-temperature magneto-transport properties of monolayer
epitaxial graphene films formed on the Si-face of semi-insulating 4H-SiC
substrates by a high temperature sublimation process. A high-k top-gate on the
epitaxial graphene is realized by inserting a fully oxidized nanometer thin
aluminum film a... | 1112.4345v2 |
2012-01-11 | Critical fields and growth rates of the Tayler instability as probed by a columnar gallium experiment | Many astrophysical phenomena (such as the slow rotation of neutron stars or
the rigid rotation of the solar core) can be explained by the action of the
Tayler instability of toroidal magnetic fields in the radiative zones of stars.
In order to place the theory of this instability on a safe fundament it has
been realize... | 1201.2318v3 |
2012-01-30 | Composition-dependent interatomic potentials: A systematic approach to modelling multicomponent alloys | We propose a simple scheme to construct composition-dependent interatomic
potentials for multicomponent systems that when superposed onto the potentials
for the pure elements can reproduce not only the heat of mixing of the solid
solution in the entire concentration range but also the energetics of a wider
range of con... | 1201.6284v1 |
2012-02-07 | Telecommunication band InAs quantum dots and dashes embedded in different barrier materials | We investigate the long wavelength (1.2 to 1.55 micro-m) photoluminescence of
high-density InAs quantum dots and dashes, which were grown on InP substrates.
We analyze the temperature dependence of the recombination and carrier
distribution on the alloy composition of the barrier materials, InGaAlAs, and
on the existen... | 1202.1360v1 |
2012-02-08 | Thermodynamic analysis of the Quantum Critical behavior of Ce-lattice compounds | A systematic analysis of low temperature magnetic phase diagrams of Ce
compounds is performed in order to recognize the thermodynamic conditions to be
fulfilled by those systems to reach a quantum critical regime and,
alternatively, to identify other kinds of low temperature behaviors. Based on
specific heat ($C_m$) an... | 1202.1724v1 |
2012-03-13 | Membrane-based nanocalorimeter for high-resolution measurements of low-temperature specific heat | A differential, membrane-based nanocalorimeter for general specific heat
studies of very small samples, ranging from 0.5 mg to sub-{\mu}g in mass, is
described. The calorimeter operates over the temperature range from above room
temperature down to 0.5 K. It consists of a pair of cells, each of which is a
stack of heat... | 1203.2838v1 |
2012-03-14 | Magnetic Interactions in Ge/1-x/Cr/x/Te Semimagnetic Semiconductors | We present the studies of magnetic properties of Ge/1-x/Cr/x/Te diluted
magnetic semiconductor with changeable chemical composition 0.016 \leq x \leq
0.061. A spin-glass state (at T \leq 35 K) for x = 0.016 and 0.025 and a
ferromagnetic phase (at T < 60 K) for x \geq 0.030 are observed. The long range
carrier-mediated ... | 1203.3044v2 |
2012-04-21 | Ab-initio study of different structures of CaC: Magnetism, Bonding, and Lattice Dynamics | On the basis of ab-initio pseudopotential calculations, we study structural,
magnetic, dynamical, and mechanical properties of the hypothetical CaC ionic
compound in the rock-salt (RS), B2, zinc-blende (ZB), wurtzite (WZ), NiAs (NA),
anti-NiAs (NA*), and CrB (B33) structures. It is argued that the ZB, WZ, NA,
and RS st... | 1204.4781v2 |
2012-05-10 | Development of liquid helium-3 target for experimental studies of antikaon-nucleon interaction at J-PARC | A liquid helium-3 target system was developed for experimental studies of
kaonic atoms and kaonic nuclei at J-PARC. helium-3 gas is liquefied in a heat
exchanger cooled below 3.2 K by decompression of liquid helium-4. To maintain a
large acceptance of the cylindrical detector system for decay particles of
kaonic nuclei... | 1205.2183v1 |
2012-06-04 | Phase stability, elastic, electronic, thermal and optical properties of Ti3Al1-xSixC2 (0 LE x LE 1): First-principles study | The structural parameters with stability upon Si incorporation and elastic,
electronic, thermodynamic and optical properties of Ti3Al1-xSixC2 (0 \leq x
\leq 1) are investigated systematically by the plane wave psedudopotential
method based on the density functional theory (DFT). The increase of some
elastic parameters ... | 1206.0545v2 |
2012-06-04 | Modern consumerism and the waste problem | With the advance of industrial mass production, modern micro-electronics and
computers, the intervals between the release of new generations of consumer
products have been dramatically reduced and so have their lifetime cycles.
While it was very natural in the post-war era, that sophisticated consumer
products like tel... | 1206.0604v1 |
2012-06-04 | Spin texture on the Fermi surface of tensile strained HgTe | We present ab initio and k.p calculations of the spin texture on the Fermi
surface of tensile strained HgTe, which is obtained by stretching the
zincblende lattice along the (111) axis. Tensile strained HgTe is a semimetal
with pointlike accidental degeneracies between a mirror symmetry protected
twofold degenerate ban... | 1206.0684v2 |
2012-06-04 | Topological Surface States and Dirac point tuning in ternary Bi2Te2Se class of topological insulators | Using angle-resolved photoemission spectroscopy, we report electronic
structure for representative members of ternary topological insulators. We show
that several members of this family, such as Bi2Se2Te, Bi2Te2Se, and GeBi2Te4,
exhibit a singly degenerate Dirac-like surface state, while Bi2Se2S is a fully
gapped insul... | 1206.0695v2 |
2012-06-11 | Observation of Topological Crystalline Insulator phase in the lead tin chalcogenide Pb1-xSnxTe material class | We perform systematic angle-resolved photoemission spectroscopic measurements
on the lead tin telluride Pb1-xSnxTe pseudobinary alloy system. We show that
the (001) crystalline surface, which is a crystalline surface symmetric about
the (110) mirror planes of the Pb1-xSnxTe crystal, pos- sesses four metallic
surface st... | 1206.2088v1 |
2012-08-10 | Precise calibration of Mg concentration in MgxZn1-xO thin films grown on ZnO substrates | The growth techniques for MgxZn1-xO thin films have advanced at a rapid pace
in recent years, enabling the application of this material to a wide range of
optical and electrical applications. In designing structures and optimizing
device performances, it is crucial that the Mg content of the alloy be
controllable and p... | 1208.2074v1 |
2012-08-16 | High superconducting anisotropy and weak vortex pinning in Co doped LaFeAsO | Here, we present an electrical transport study in single crystals of
LaFe$_{0.92}$Co$_{0.08}$AsO ($T_c \simeq 9.1$ K) under high magnetic fields. In
contrast to most of the previously reported Fe based superconductors, and
despite its relatively low $T_c$, LaFe$_{1-x}$Co$_x$AsO shows a superconducting
anisotropy which ... | 1208.3435v1 |
2012-10-09 | La fonte algébrique des Méthodes nouvelles de la mécanique céleste d'Henri Poincaré | Poincar\'e's approach to the three body problem has often been celebrated as
a starting point of chaos theory in relation to the investigation of dynamical
systems. Yet, Poincar\'e's strategy can also be analyzed as molded on - or
casted in - some specific algebraic practices for manipulating systems of
linear equation... | 1210.2673v1 |
2012-10-11 | Quantum critical state in a magnetic quasicrystal | Quasicrystals are metallic alloys that possess long-range, aperiodic
structures with diffraction symmetries forbidden to conventional crystals.
Since the discovery of quasicrystals by Schechtman et al. at 1984 (ref. 1),
there has been considerable progress in resolving their geometric structure.
For example, it is well... | 1210.3160v1 |
2012-11-02 | Direct Observation of Giant Saturation Magnetization in Fe16N2 | Magnetic materials with giant saturation magnetization have been a holy grail
for magnetic researchers and condensed matter physicists for decades because of
its great scientific and technological impacts. As described by the famous
Slater-Pauling curve the material with highest Ms is the Fe65Co35 alloy. This
was chall... | 1211.0553v1 |
2012-11-05 | Structure and Thermodynamical Properties of Zirconium hydrides from first-principle | Zirconium alloys are used as nuclear fuel cladding material due to their
mechanical and corrosion resistant properties together with their favorable
cross-section for neutron scattering. At running conditions, however, there
will be an increase of hydrogen in the vicinity of the cladding surface at the
water side of th... | 1211.0858v1 |
2012-12-04 | Application of photoreflectance to advanced multilayer structures for photovoltaics | Photoreflectance (PR) is a convenient characterization tool able to reveal
optoelectronic properties of semiconductor materials and structures. It is a
simple non-destructive and contactless technique which can be used in air at
room temperature. We will present experimental results of the characterization
carried out ... | 1212.0680v1 |
2012-12-07 | Binding of an oxide layer to a metal: the case of Ti(10-10)/TiO2(100) | We study the chemical nature of the bonding of an oxide layer to the parent
metal. In order to disentangle chemical effects from strain/misfit,
Ti(10$\bar{1}$0)/TiO$_{2}$(100) interface has been chosen. We use the density
functional pseudopotential method which gives good agreement with experiment
for known properties ... | 1212.1659v1 |
2013-01-02 | Ab initio calculation of anisotropic interfacial excess free energies | We describe a simple method to determine, from ab initio calculations, the
complete orientation-dependence of interfacial free energies in solid-state
crystalline systems. We illustrate the method with an application to
precipitates in the Al-Ti alloy system. The method combines the cluster
expansion formalism in its m... | 1301.0168v2 |
2013-01-29 | Cluster packing geometry for Al-based F-type icosahedral alloys | This paper presents a new highly stable periodic approximant to the Al-based
F-type icosahedral quasicrystals, i-Al-Pd-TM (TM=transition metals). The
structure of this intermetallic Al-Pd-Cr-Fe compound is determined ab initio
using single-crystal X-ray diffraction, where the space group is identified to
be Pa-3 and th... | 1301.6823v1 |
2013-02-08 | The hybrid lattice of KxFe2-ySe2: why superconductivity and magnetism can coexist | Much remains unknown of the microscopic origin of superconductivity when it
materializes in atomically disordered systems as in amorphous alloys (1) or in
crystals riddled with defects(2). A manifestation of this conundrum is
envisaged in the highly defective iron chalcogenide superconductors of
KxFe2-ySe2 (3-6). How c... | 1302.2162v1 |
2013-02-15 | Road to room-temperature superconductivity: A universal model | In a semiclassical view superconductivity is attributed exclusively to the
advance of atoms' outer s electrons through the nuclei of neighbor atoms in a
solid. The necessary progression of holes in the opposite direction has the
electric and magnetic effect as if two electrons were advancing instead of each
actual one.... | 1302.5043v2 |
2013-03-02 | Determination of the Stopping Power and Failure-time of Spacecraft Components due to Proton Interaction Using GOES 11 Acquisition Data | One of the several ways to describe the net effect of charged-particles'
interaction is the rate of energy loss along the particles' path. In this
study, the mass stopping power (Sp) of selected spacecraft composite materials,
through which the particle traverses, its range (R) and the distance (d)
travelled (by the pa... | 1303.0434v1 |
2013-03-07 | On a dislocation density based two-phase plasticity model: refinement and extension to non-proportional loading | The two-phase composite approach of Estrin et al. (1998) describes an
evolving dislocation cell structure. Mckenzie et al. (2007) enhanced the model
to capture the effects of hydrostatic pressure and temperature during severe
plastic deformation. The goal of the present study is to incorporate this
microstructural mode... | 1303.1731v1 |
2013-04-04 | RKKY interaction in heavily vacant graphene | Dirac electrons in clean graphene can mediate the interactions between two
localized magnetic moments. The functional form of the RKKY interaction in
pristine graphene is specified by two main features: (i) an atomic scale
oscillatory part determined by a wave vector $\vec Q$ connecting the two
valleys. Furthermore wit... | 1304.1272v1 |
2013-04-24 | General Phase-Field Model with Stability Requirements on Interfaces in $N$-Dimensional Phase-Field Space | In this paper a general multi-phase-field model is presented which is an
extension and modification of the model proposed by Folch and Plapp for three
phase fields [R. Folch and M. Plapp, Phys. Rev. E 72 011602 (2005)] to the
arbitrary number of phases. In the model a physical constraint requiring that
the sum of all p... | 1304.6549v2 |
2013-04-30 | Universal scaling in disordered systems and non-universal exponents | The effect of an electric field on conduction in a disordered system is an
old but largely unsolved problem. Experiments cover an wide variety of systems
- amorphous/doped semiconductors, conducting polymers, organic crystals,
manganites, composites, metallic alloys, double perovskites - ranging from
strongly localized... | 1305.0031v2 |
2013-05-10 | Multi-q Pattern Classification of Polarization Curves | Several experimental measurements are expressed in the form of
one-dimensional profiles, for which there is a scarcity of methodologies able
to classify the pertinence of a given result to a specific group. The
polarization curves that evaluate the corrosion kinetics of electrodes in
corrosive media are an application ... | 1305.2876v1 |
2013-05-16 | Different routes to pressure-induced volume collapse transitions in gadolinium and terbium metals | The sudden decrease in molar volume exhibited by most lanthanides under high
pressure is often attributed to changes in the degree of localization of their
4f-electrons. We give evidence, based on electrical resistivity measurements of
dilute Y(Gd) and Y(Tb) alloys to 120 GPa, that the volume collapse transitions
in Gd... | 1305.3852v4 |
2013-06-04 | Majorana bound states in d-wave superconductor-based hybrid systems | For the search of Majorana fermions, we propose to employ a ramp-type
Josephson edge junction between a normal metal such as Au, Ag or alloys of
heavy metals and a topologically-trivial dx2-y2 wave high-Tc superconductor
YBa2Cu3O7. The success in forming the elusive zero-energy Majorana bound states
(MBS) at the juncti... | 1306.0652v2 |
2013-06-14 | Magnetic structures of Mn3-xFexSn2: an experimental and theoretical study | We investigate the magnetic structure of Mn3-xFexSn2 using neutron powder
diffraction experiments and electronic structure calculations. These alloys
crystallize in the orthorhombic Ni3Sn2 type of structure (Pnma) and comprise
two inequivalent sites for the transition metal atoms (4c and 8d) and two Sn
sites (4c and 4c... | 1306.3339v1 |
2013-06-18 | Magnetic anisotropy and lattice dynamics in FeAs studied by Mössbauer spectroscopy | Iron mono-arsenide in the powder form has been investigated by transmission
57Fe Moessbauer spectroscopy in the temperature range 4.2 - 1000 K. Additional
spectra have been obtained at 20 K and 100 K applying external magnetic field
of 7 T. It was found that the spin spiral propagating along the c-axis leads to
the com... | 1306.4170v3 |
2013-06-18 | Thermoelectric effects and the asymmetry of the current-voltage characteristics of metallic point contacts | An asymmetry as a function of the direction of current flow is observed in
the current-voltage characteristic (CVC) and its first and second derivatives
for point heterocontacts between pure metals {Cu, Ni, Fe) as well as between
these metals and dilute alloys (CuFe, CuMn). It is shown that the observed
asymmetry is ca... | 1306.4189v1 |
2013-06-28 | Impact of sintering temperature on room temperature magneto-resistive and magneto-caloric properties of Pr2/3Sr1/3MnO3 | Magneto-resistive and magneto-caloric properties of polycrystalline
Pr2/3Sr1/3MnO3 have been studied as a function of sintering temperature (Ts)
between 1260-1450{\deg}C. Reitveld refinement of their X-ray diffraction (XRD)
patterns confirms their single phase crystalline structure with orthorhombic
Pbnm space group. T... | 1306.6792v2 |
2013-07-01 | Electronic fine structure in the nickel carbide superconductor Th$_{2}$NiC$_{2}$ | The recently reported nickel carbide superconductor, body centered tetragonal
$I4/mmm$ Th$_2$NiC$_2$ with T$_c$ = 8.5 K increasing to 11.2 K upon alloying Th
with Sc, is found to have very fine structure in its electronic spectrum,
according to density functional based first principles calculations. The filled
Ni 3d ba... | 1307.0415v1 |
2013-07-09 | Neutron diffraction evidence for kinetic arrest of first-order magneto-structural phase transitions in some functional magnetic materials | Neutron diffraction measurements, performed in presence of an external
magnetic field, have been used to show structural evidence for the kinetic
arrest of the first-order phase transition from (i) the high temperature
austenite phase to the low temperature martensite phase in the magnetic shape
memory alloy Ni37Co11Mn... | 1307.2486v3 |
2013-09-10 | Thermodynamic interpretation of reactive processes in Ni-Al nanolayers from atomistic simulations | Metals which can form intermetallic compounds by an exothermic reaction
constitute a class of reactive materials with multiple applications. Ni-Al
laminates of thin alternating layers are being considered as model nanometric
metallic multilayers for studying various reaction processes. However, the
reaction kinetics at... | 1309.2664v3 |
2013-09-12 | Thermodynamic Stability of Mg-based Ternary Long-Period Stacking Ordered Structures | Mg alloys containing long-period stacking ordered (LPSO) structures exhibit
remarkably high tensile yield strength and ductility. They have been found in a
variety of ternary Mg systems of the general form Mg-XL-XS, where XL and XS are
elements larger and smaller than Mg, respectively. In this work, we examine the
ther... | 1309.3184v1 |
2013-10-25 | The effect of a micro bubble dispersed gas phase on hydrogen isotope transport in liquid metals under nuclear irradiation | The present work intend to be a first step towards the understanding and
quantification of the hydrogen isotope complex phenomena in liquid metals for
nuclear technology. Liquid metals under nuclear irradiation in,e.g., breeding
blankets of a nuclear fusion reactor would generate tritium which is to be
extracted and re... | 1310.6875v1 |
2013-10-28 | Analysis of interior penalty discontinuous Galerkin methods for the Allen-Cahn equation and the mean curvature flow | This paper develops and analyzes two fully discrete interior penalty
discontinuous Galerkin (IP-DG) methods for the Allen-Cahn equation, which is a
nonlinear singular perturbation of the heat equation and originally arises from
phase transition of binary alloys in materials science, and its sharp interface
limit (the m... | 1310.7504v2 |
2013-11-07 | Crystal lattice rules disordered states | Based on classical statistical thermodynamics, we develop a theoretical
approach that provides new insight into how macroscopic and microscopic
physical properties are bridged via crystal lattice for condensed mat- ters. We
find that in order to determine macroscopic physical properties and their
temperature dependence... | 1311.1664v7 |
2013-11-14 | Electric field gradient wave (EFGW) in iron-based superconductor Ba(0.6)K(0.4)Fe2As2 studied by Mössbauer spectroscopy | The optimally doped 122 iron-based superconductor Ba(0.6)K(0.4)Fe2As2 has
been studied by 57Fe Moessbauer spectroscopy versus temperature ranging from
4.2 K till 300 K with particular attention paid to the superconducting
transition around 38 K. The spectra do not contain magnetic components and they
exhibit quasi-cont... | 1311.3503v4 |
2013-11-21 | Reducing beam hardening effects and metal artefacts using Medipix3RX: With applications from biomaterial science | This paper discusses methods for reducing beam hardening effects using
spectral data for biomaterial applications. A small-animal spectral scanner
operating in the diagnostic energy range was used. We investigate the use of
photon-processing features of the Medipix3RX ASIC in reducing beam hardening
and associated arte... | 1311.5303v1 |
2013-11-26 | Recent Progress in III-V based ferromagnetic semiconductors: Band structure, Fermi level, and tunneling transport | Spin-based electronics or spintronics is an emerging field, in which we try
to utilize spin degrees of freedom as well as charge transport in materials and
devices. While metal-based spin-devices, such as magnetic-field sensors and
magnetoresistive random access memory using giant magnetoresistance and
tunneling magnet... | 1311.6616v1 |
2014-01-16 | Homogeneous limit of Cd(1-x)Mn(x)GeAs(2) alloy: electrical and magnetic properties | We present the studies of structural, electrical, and magnetic properties of
bulk Cd$_{1\textrm{-}x}$Mn$_{x}$GeAs$_{2}$ crystals with low Mn content, $x$,
varying from 0 to 0.037. The studied samples have excellent crystallographic
quality indicated by the presence of diffraction patterns never before observed
experime... | 1401.4037v2 |
2014-01-18 | Predicting the steady state thickness of passive films in order to prevent degradations of implant | Some implants have approximately a lifetime of 15 years. The femoral stem,
for example, should be made of 316L/316LN stainless steel. Fretting corrosion,
friction under small displacements, should occur during human gait, due to
repeated loadings and un-loadings, between stainless steel and bone for
instance. Some expe... | 1401.4570v1 |
2014-02-10 | Tuning the band gap of PbCrO4 through high-pressure: Evidence of wide-to-narrow semiconductor transitions | The electronic transport properties and optical properties of lead(II)
chromate (PbCrO4) have been studied at high pressure by means of resistivity,
Hall-effect, and optical-absorption measurements. Band-structure
first-principle calculations have been also performed. We found that the
low-pressure phase is a direct ba... | 1402.2139v1 |
2014-03-06 | Quadrupolar induced suppression of nuclear spin bath fluctuations in self-assembled quantum dots | Decoherence in quantum logic gates (qubits) due to interaction with the
surrounding environment is a major obstacle to the practical realization of
quantum information technologies. For solid state electron-spin qubits the
interaction with nuclear spins is the main problem. One particular, neradicable
source of electro... | 1403.1510v2 |
2014-03-19 | Pt-based nanowire networks with enhanced oxygen-reduction activity | Pt-Al and Pt-Y-Al thin film electrodes on yttria-stabilised zirconia
electrolytes were prepared by dealloying of co-sputtered Pt-Al or Pt-Y-Al
films. The selective dissolution of Al from the Pt-alloy compound causes the
formation of a highly porous nanowire network with a mean branch thickness
below 25 nm and a pore in... | 1403.4665v4 |
2014-03-31 | Tensile strained $In_{x}Ga_{1-x}P$ membranes for cavity optomechanics | We investigate the optomechanical properties of tensile-strained ternary
InGaP nanomembranes grown on GaAs. This material system combines the benefits
of highly strained membranes based on stoichiometric silicon nitride, with the
unique properties of thin-film semiconductor single crystals, as previously
demonstrated w... | 1404.0029v1 |
2014-04-15 | Muon spin rotation and relaxation in Pr$_{1-x}$Nd$_x$Os$_4$Sb$_{12}$: Magnetic and superconducting ground states | Muon spin rotation and relaxation ($\mu$SR) experiments have been carried out
to characterize magnetic and superconducting ground states in the
Pr$_{1-x}$Nd$_x$Os$_4$Sb$_{12}$ alloy series. In the ferromagnetic end compound
NdOs$_4$Sb$_{12}$ the spontaneous local field at positive-muon ($\mu^+$) sites
below the orderin... | 1404.4090v1 |
2014-04-16 | Origin of High Temperature Oxidation Resistance of Ti-Al-Ta-N Coatings | Alloying Ti-Al-N coatings with Ta has proven to enhance their hardness,
thermal stability, and oxidation resistance. However, especially for
arc-evaporated Ti-Al-Ta-N coatings only limited information on the detailed
influence of the elements on various properties is available. Therefore, we
have developed arc-evaporat... | 1404.4345v1 |
2014-04-07 | Liquid Metal as Connecting or Functional Recovery Channel for the Transected Sciatic Nerve | In this article, the liquid metal GaInSn alloy (67% Ga, 20.5% In, and 12.5%
Sn by volume) is proposed for the first time to repair the peripheral
neurotmesis as connecting or functional recovery channel. Such material owns a
group of unique merits in many aspects, such as favorable fluidity, super
compliance, high elec... | 1404.5931v1 |
2014-05-01 | Helical Antiferromagnetic Ordering in Lu{1-x}Sc{x}MnSi (x = 0, 0.25, 0.50) | Polycrystalline samples of Lu{1-x}Sc{x}MnSi (x= 0, 0.25, 0.50) are studied
using powder x-ray diffraction (XRD), heat capacity Cp, magnetization M,
magnetic susceptibility chi, and electrical resistivity rho measurements versus
temperature T and magnetic field H. This system crystallizes in the primitive
orthorhombic T... | 1405.0202v1 |
2014-05-26 | Amorphous ferromagnetism and re-entrant magnetic glassiness in Sm$_{2}$Mo$_{2}$O$_{7}$: new insights into the electronic phase diagram of pyrochlore molybdates | We discuss the magnetic properties of a Sm$_{2}$Mo$_{2}$O$_{7}$ single
crystal as investigated by means of different experimental techniques. In the
literature, a conventional itinerant ferromagnetic state is reported for the
Mo$^{4+}$ sublattice below $\sim 78$ K. However, our results of dc
magnetometry, muon spin spe... | 1405.6608v1 |
2014-07-21 | Pressure-induced giant enhancement of magnetocaloric effects in MnNiSi-based systems | A remarkable decrease of the structural transition temperature of MnNiSi from
1200 K to <300 K by chemically alloying it with MnFeGe results in a coupling of
the magnetic and structural transitions, leading to a large magnetocaloric
effect near room temperature. It was found that the magnetostructural
transition is hig... | 1407.5689v1 |
2014-08-01 | Ab initio study of InxGa(1-x)N - performance of the alchemical mixing approximation | The alchemical mixing approximation which is the ab initio pseudopotential
specific implementation of the virtual crystal approximation (VCA), offered in
the ABINIT package, has been employed to study the wurtzite (WZ) and zinc
blende (ZB) InxGa(1-x)N alloy from first principles. The investigations were
focused on stru... | 1408.0106v1 |
2014-08-25 | Synthesis of Component and Connector Models from Crosscutting Structural Views | We present component and connector (C&C) views, which specify structural
properties of component and connector models in an expressive and intuitive
way. C&C views provide means to abstract away direct hierarchy, direct
connectivity, port names and types, and thus can crosscut the traditional
boundaries of the implemen... | 1408.5696v1 |
2014-09-03 | DC magnetization studies of nano- and micro-particles of bilayered manganite LaSr2Mn2O7 | Systematic studies of magnetic properties of LaSr2Mn2O7 as a function of
crystalline grain size provide information on how the crystalline grain size
affects the magnetic and charge ordering in this compound. The half-doped
bi-layered manganite LaSr2Mn2O7 (x=0.5) in its bulk form has CE-type
antiferromagnetic (CE-AFM) ... | 1409.0945v2 |
2014-09-11 | Anisotropic magnetoresistance in antiferromagnetic Sr2IrO4 | We report point-contact measurements of anisotropic magnetoresistance (AMR)
in a single crystal of antiferromagnetic (AFM) Mott insulator Sr2IrO4. The
point-contact technique is used here as a local probe of magnetotransport
properties on the nanoscale. The measurements at liquid nitrogen temperature
revealed negative ... | 1409.3491v2 |
2014-09-24 | Radiation-induced softening of Fe and Fe-based alloys during in-situ electron irradiation under mechanical testing | Defects formed under irradiation in the bulk act as additional pinning
centers resulting in the well-known effect of radiation-induced hardening. On
the other hand, there is a poorly understood but well-established effect of
instant and reversible softening of metals subjected to various types of
irradiation. This radi... | 1409.6799v1 |
2014-10-01 | Evidence for magnetic clusters in Ni$_{1-x}$V$_{x}$ close to the quantum critical concentration | The d-metal alloy Ni$_{1-x}$V$_{x}$ undergoes a quantum phase transition from
a ferromagnetic ground state to a paramagnetic ground state as the vanadium
concentration $x$ is increased. We present magnetization, ac-susceptibility and
muon-spin relaxation data at several vanadium concentrations near the critical
concent... | 1410.0094v1 |
2014-10-27 | Self-assembly of the decagonal quasicrystalline order in simple three-dimensional systems | For a three dimensional system we answer two questions, how simple a particle
system might be to show the quasicrystal order and, what system features are
the most important for quasicrystal formation? One-component system of
particles with isotropic pair interaction is one of the simplest ones. We show
that such syste... | 1410.7294v4 |
2014-10-31 | Local character of the highest antiferromagnetic Ce-system CeTi{1-x}Sc{x} Ge | The highest antiferromagnetic (AFM) temperature in Ce based compounds has
been reported for CeScGe with Tn=47K, but its local or itinerant nature was not
deeply investigated yet. In order to shed more light into this unusually high
ordering temperature we have investigated structural, magnetic, transport and
thermal pr... | 1410.8850v1 |
2014-11-10 | Parameter estimation in spherical symmetry groups | This paper considers statistical estimation problems where the probability
distribution of the observed random variable is invariant with respect to
actions of a finite topological group. It is shown that any such distribution
must satisfy a restricted finite mixture representation. When specialized to
the case of dist... | 1411.2540v2 |
2014-11-13 | Quantum Critical Fluctuations in the Heavy fermion compound Ce(Ni$_{0.935}$Pd$_{0.065}$)$_2$Ge$_2$ | Electric resistivity, specific heat, magnetic susceptibility, and inelastic
neutron scattering experiments were performed on a single crystal of the heavy
fermion compound Ce(Ni$_{0.935}$Pd$_{0.065}$)$_2$Ge$_2$ in order to study the
spin fluctuations near an antiferromagnetic (AF) quantum critical point (QCP).
The resi... | 1411.3689v1 |
2014-12-10 | Enhancement and reduction of one-dimensional heat conduction with correlated mass disorder | Short-range order in strongly disordered structures plays an important role
in their heat conduction property. Using numerical and analytical methods, we
show that short-range spatial correlation (with a correlation length of
$\Lambda_{m}$) in the mass distribution of the one-dimensional (1D) alloy-like
random binary l... | 1412.3214v1 |
2014-12-19 | Nonlocality in microscale heat conduction | Thermal transport at short length and time scales inherently constitutes a
nonlocal relation between heat flux and temperature gradient, but this is
rarely addressed explicitly. Here, we present a formalism that enables detailed
characterisation of the delocalisation effects in nondiffusive heat flow
regimes. A convolu... | 1412.6555v2 |
2014-12-23 | First-principles calculations of indirect Auger recombination in nitride semiconductors | Auger recombination is an important non-radiative carrier recombination
mechanism in many classes of optoelectronic devices. The microscopic Auger
processes can be either direct or indirect, mediated by an additional
scattering mechanism such as the electron-phonon interaction. Phonon-assisted
Auger recombination is pa... | 1412.7555v2 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.