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2014-12-23 | Pressure effects on the superconductivity of HfPd2Al Heusler compound: Experimental and theoretical study | Polycrystalline HfPd2Al has been synthesized using the arc-melting method and
studied under ambient pressure conditions by x-ray diffraction from room
temperature up to 450^oC. High pressure x-ray diffraction up to 23 GPa was also
performed using Diacell-type membrane diamond anvil cells. The estimated linear
thermal e... | 1412.7362v2 |
2015-01-27 | Transition from semiconducting to metallic-like conducting and weak antilocalization effect in single crystals of LuPtSb | High quality half-Heusler single crystals of LuPtSb have been synthesized by
a Pb flux method. The temperature dependent resistivity and Hall effects
indicate that the LuPtSb crystal is a p-type gapless semiconductor showing a
transition from semiconducting to metallic conducting at 150 K. Moreover, a
weakly temperatur... | 1501.06714v1 |
2015-02-02 | Large linear magnetoresistance and weak anti-localization in Y(Lu)PtBi topological insulators | Topological insulators are new kind of Dirac materials that possess bulk
insulating and surface conducting behavior. They are basically known for their
unique electronic properties at the surface. Here we present the
magneto-transport properties of our high quality single crystalline Y(Lu)PtBi
Heusler topological insul... | 1502.00604v2 |
2015-03-12 | Shubnikov-de Haas oscillations, weak antilocalization effect and large linear magnetoresistance in the putative topological superconductor LuPdBi | We present electronic transport and magnetic properties of single crystals of
semimetallic half-Heusler phase LuPdBi, having theoretically predicted band
inversion requisite for nontrivial topological properties. The compound
exhibits superconductivity below a critical temperature $T_{\rm c}=1.8\,$K,
with a zero-temper... | 1503.03697v1 |
2015-04-14 | Reduced thermal conductivity of TiNiSn/HfNiSn superlattices | Diminution of the thermal conductivity is a crucial aspect in thermoelectric
research. We report a systematic and significant reduction of the cross-plane
thermal conductivity in a model system consisting of DC sputtered TiNiSn and
HfNiSn half-Heusler superlattices. The reduction of $\kappa$ is measured by the
3$\omega... | 1504.03468v2 |
2015-06-07 | Experimental observation of the interaction of propagating spin waves with Néel domain walls in a Landau domain structure | The interaction of propagating dipolar spin waves with magnetic domain walls
is investigated in square-shaped microstructures patterned from the Heusler
compound Co$_2$Mn$_{0.6}$Fe$_{0.4}$Si. Using magnetic force microscopy, the
reversible preparation of a Landau state with four magnetic domains separated
by N\'eel dom... | 1506.02303v1 |
2015-10-21 | Unconventional superconductivity in YPtBi and related topological semimetals | YPtBi, a topological semimetal with very low carrier density, was recently
found to be superconducting below $T_\mathrm{c} = 0.77$\,K. In the conventional
theory, the nearly vanishing density of states around the Fermi level would
imply a vanishing electron-phonon coupling and would therefore not allow for
superconduct... | 1510.06209v2 |
2015-12-18 | Antiferromagnetism and superconductivity in the half-Heusler semimetal HoPdBi | We observed the coexistence of superconductivity and antiferromagnetic order
in the single-crystalline ternary pnictide HoPdBi, a plausible topological
semimetal. The compound orders antiferromagnetically at $T_N =$1.9 K and
exhibits superconductivity below $T_c =$0.7 K, which was confirmed by magnetic,
electrical tran... | 1512.05972v1 |
2016-04-25 | Room temperature tetragonal noncollinear antiferromagnet Pt$_2$MnGa | Here we present the tetragonal stoichiometric Heusler compound Pt$_2$MnGa
with the noncollinear AFM order stable up to 350 K. It is resolved by the
neutron diffraction as a helical spiral propagating along the tetragonal axis.
Ab-initio calculations suggest a pure exchange origin of the spiral and explain
its helical c... | 1604.07137v1 |
2016-05-01 | First clear evidence of quantum chaos in the bound states of an atomic nucleus | We study the spectral fluctuations of the $^{208}$Pb nucleus using the
complete experimental spectrum of 151 states up to excitation energies of
$6.20$ MeV recently identified at the Maier-Leibnitz-Laboratorium at Garching,
Germany. For natural parity states the results are very close to the
predictions of Random Matri... | 1605.00210v1 |
2016-07-01 | Generation of Spin Currents by Magnetic Field in $\mathcal{T}$- and $\mathcal{P}$-Broken Materials | Pure spin currents carry information in quantum spintronics and could play an
essential role in the next generation low-energy-consumption electronics. Here
we theoretically predict that the magnetic field can induce a quantum spin
current without a concomitant charge current in metals without time reversal
symmetry $\... | 1607.00116v1 |
2016-07-01 | Ultra-high vacuum compatible induction-heated rod casting furnace | We report the design of a radio-frequency induction-heated rod casting
furnace that permits the preparation of polycrystalline ingots of intermetallic
compounds under ultra-high vacuum compatible conditions. The central part of
the system is a bespoke water-cooled Hukin crucible supporting a casting mold.
Depending on ... | 1607.00821v1 |
2016-09-22 | Quantum-Many-Body Intermetallics: Phase Stability of Fe$_3$Al and Small-Gap Formation in Fe$_2$VAl | Various intermetallic compounds harbor subtle electronic correlation effects.
To elucidate this fact for the Fe-Al system, we perform a realistic many-body
investigation based on the combination of density functional theory with
dynamical mean-field theory in a charge self-consistent manner. A better
characterization a... | 1609.06928v2 |
2016-10-21 | Giant Positive Magnetoresistance and field-induced metal insulator transition in Cr2NiGa | We report here the magneto-transport properties of the newly synthesized
Heusler compound Cr2NiGa which crystallizes in a disordered cubic B2 structure
belonging to Pm-3m space group. The sample is found to be paramagnetic down to
2 K with metallic character. On application of magnetic field, a significantly
large incr... | 1610.06771v1 |
2016-11-13 | Topological Materials: Weyl Semimetals | Topological insulators and topological semimetals are both new classes of
quantum materials, which are characterized by surface states induced by the
topology of the bulk band structure. Topological Dirac or Weyl semimetals show
linear dispersion round nodes, termed the Dirac or Weyl points, as the
three-dimensional an... | 1611.04182v2 |
2017-01-06 | Generic coexistence of Fermi arcs and Dirac cones on the surface of time-reversal invariant Weyl semimetals | The hallmark of Weyl semimetals is the existence of open constant-energy
contours on their surface -- the so-called Fermi arcs -- connecting Weyl
points. Here, we show that for time-reversal symmetric realizations of Weyl
semimetals these Fermi arcs in many cases coexist with closed Fermi pockets
originating from surfa... | 1701.01660v3 |
2017-03-04 | Impact of Anisotropy on Antiferromagnet Rotation in Heusler-type Ferromagnet/Antiferromagnet Epitaxial Bilayers | We report the magnetotransport properties of ferromagnet (FM)/antiferromagnet
(AFM) Fe$_2$CrSi/Ru$_2$MnGe epitaxial bilayers using current-in-plane
configurations. Above the critical thickness of the Ru$_2$MnGe layer to induce
exchange bias, symmetric and asymmetric curves were observed in response to the
direction of ... | 1703.01406v2 |
2017-03-15 | Two-channel conduction in YbPtBi | We investigated transport, magnetotransport, and broadband optical properties
of the half-Heusler compound YbPtBi. Hall measurements evidence two types of
charge carriers: highly mobile electrons with a temperature-dependent
concentration and low-mobile holes; their concentration stays almost constant
within the invest... | 1703.05202v1 |
2017-03-20 | Topological phase transitions in multi-component superconductors | We study the phase transition between a trivial and a time-reversal-invariant
topological superconductor in a single-band system. By analyzing the interplay
of symmetry, topology and energetics, we show that for a generic normal state
band structure, the phase transition occurs via extended intermediate phases in
which... | 1703.06880v2 |
2017-07-23 | Majorana surface modes of nodal topological pairings in spin-$\frac{3}{2}$ semi-metals | Multi-component electronic systems can appear in solid state systems with
active orbital band structures. They exhibit richer structures of topological
superconductivity beyond the conventional scenarios of spin singlet and triplet
pairings in spin-$\frac{1}{2}$ systems. Examples include the half-Heusler
compounds RPtB... | 1707.07261v3 |
2017-11-07 | YbPd$_2$In: a promising candidate to strong entropy accumulation at very low temperature | We report on synthesis, crystal structure, magnetic, thermodynamic and
transport properties of the new compound YbPd$_2$In, crystallizing as a Heusler
structure type. A trivalent state of the rare earth was determined by fitting
the magnetic susceptibility with a Curie-Weiss law. This compound is
characterized by showi... | 1711.02335v3 |
2017-11-11 | Planar Hall effect in the Weyl semimetal GdPtBi | Observation of Weyl and Dirac Fermions in condensed matter systems is one of
the most important discoveries. Among the very few available tools to
characterize Weyl semimetals through electrical transport, negative
magnetoresistance is most commonly used. Considering shortcomings of this
method, new tools to characteri... | 1711.04133v2 |
2017-11-16 | Using the Callaway model to deduce relevant phonon scattering processes: The importance of phonon dispersion | The thermal conductivity $\kappa$ of a material is an important parameter in
many different applications. Optimization strategies of $\kappa$ often require
insight into the dominant phonon scattering processes of the material under
study. The Callaway model is widely used as an experimentalist's tool to
analyze the lat... | 1711.06153v3 |
2017-11-27 | Characterization of Spin-Transfer-Torque effect induced magnetization dynamics driven by short current pulses | We present a time-resolved study of the magnetization dynamics in a
microstructured Cr$|$Heusler$|$Pt waveguide driven by the Spin-Hall-Effect and
the Spin-Transfer-Torque effect via short current pulses. In particular, we
focus on the determination of the threshold current at which the spin-wave
damping is compensated... | 1711.09647v1 |
2017-12-30 | Singlet-Quintet Mixing in Spin-Orbit Coupled Superconductors with j=3/2 Fermions | In non-centrosymmetric superconductors, spin-orbit coupling can induce an
unconventional superconducting state with a mixture of s-wave spin-singlet and
p-wave spin-triplet channels, which leads to a variety of exotic phenomena,
including anisotropic upper critical field, magnetoelectric effect, topological
superconduc... | 1801.00083v2 |
2018-01-12 | Irradiated three-dimensional Luttinger semimetal: A factory for engineering Weyl semimetals | We study the interaction between elliptically polarized light and a
three-dimensional Luttinger semimetal with quadratic band touching using
Floquet theory. In the absence of light, the touching bands can have the same
or the opposite signs of the curvature; in each case, we show that simply
tuning the light parameters... | 1801.04287v1 |
2018-01-17 | Multiple Triple-Point Fermions in Heusler Compounds | Using the density functional theoretical calculations, we report a new set of
topological semimetals X$_{2}$YZ (X = \{Cu, Rh, Pd, Ag, Au, Hg\}, Y = \{Li, Na,
Sc, Zn, Y, Zr, Hf, La, Pr, Pm, Sm, Tb, Dy, Ho, Tm\} and Z =\{Mg, Al, Zn, Ga, Y,
Ag, Cd, In, Sn, Ta, Sm\}), which show the existence of multiple topological
triple... | 1801.05699v1 |
2018-03-02 | Linear-in-frequency optical conductivity in GdPtBi due to transitions near the triple points | The complex optical conductivity of the half-Heusler compound GdPtBi is
measured in a frequency range from 20 to 22 000 cm$^{-1}$ (2.5 meV - 2.73 eV)
at temperatures down to 10 K in zero magnetic field. We find the real part of
the conductivity, $\sigma_{1}(\omega)$, to be almost perfectly linear in
frequency over a br... | 1803.00840v2 |
2018-03-07 | Edge currents as a probe of the strongly spin-polarized topological noncentrosymmetric superconductors | Recently the influence of antisymmetric spin-orbit coupling has been studied
in novel topological superconductors such as half-Heuslers and artificial
hetero-structures. We investigate the effect of Rashba and/or Dresselhaus
spin-orbit couplings on the band structure and topological properties of a
two-dimensional nonc... | 1803.02591v1 |
2018-03-09 | Strong anomalous Nernst effect in collinear magnetic Weyl semimetals without net magnetic moments | We predict a large anomalous Nernst effect in the inverse Heusler compensated
ferrimagnets Ti$_2$Mn$X$ ($X$=Al,Ga,In) with vanishing net magnetic moments.
Though the net magnetic moment is zero, the Weyl points in these systems lead
to a large anomalous Nernst conductivity (ANC) due to the lack of a magnetic
sublattice... | 1803.03439v3 |
2018-05-15 | Spincaloric properties of epitaxial Co$_2$MnSi/MgO/Co$_2$MnSi magnetic tunnel junctions | The electronic transport and spincaloric properties of epitaxial magnetic
tunnel junctions with half-metallic Co$_2$MnSi Heusler electrodes, MgO
tunneling barriers, and different interface terminations are investigated by
using first-principles calculations. A new approach to spincaloric properties
is presented that ci... | 1805.05805v1 |
2018-05-18 | Search for alternative magnetic tunnel junctions based on all-Heusler stacks | By imposing the constraints of structural compatibility, stability and a
large tunneling magneto-resistance, we have identified the
Fe$_3$Al/BiF$_3$/Fe$_3$Al stack as a possible alternative to the
well-established FeCoB/MgO/FeCoB in the search for a novel materials platform
for high-performance magnetic tunnel junction... | 1805.08603v1 |
2018-09-19 | Structure-property relationship of Co$_2$MnSi thin films in response to He$^+$ -irradiation | We investigated the structure-property relationship of Co$_2$MnSi Heusler
thin films upon the irradiation with He$^+$ ions. The variation of the crystal
structure with increasing ion fluence has been probed using nuclear magnetic
resonance (NMR) and transmission electron microscopy (TEM), and associated with
the corres... | 1809.07097v1 |
2021-07-02 | Investigating 3D printed Cartesian Divers | Despite the difficult circumstances due to the COVID-19 pandemics, physics
students can tackle interesting questions that are part of physics competitions
as the German Physicists' Tournament (GPT) 2020. Due to the COVID-19 pandemics
in 2020, many competitions such as the GPT are held online. Furthermore, the
usual opt... | 2107.00950v1 |
2018-10-08 | Porosity-mediated High-performance Thermoelectric Materials | Whether porosity can effectively improve thermoelectric performance is still
an open question. Herein we report that thermoelectric performance can be
significantly enhanced by creating porosity in n-type
Mg3.225Mn0.025Sb1.5Bi0.49Te0.01, with a ZT of ~0.9 at 323 K and ~1.6 at 723 K,
making the average ZT much higher fo... | 1810.03356v2 |
2019-07-29 | Strain engineered higher order topological phases for spin-3/2 Luttinger fermions | Recently, the notion of topological phases of matter has been extended to
higher-order incarnations, supporting gapless modes on even lower dimensional
boundaries, such as corners and hinges. We here identify a collection of cubic
spin-3/2 fermions with biquadratic touching of Kramers degenerate valence and
conduction ... | 1907.12568v2 |
2019-10-09 | Superconductivity from Coulomb repulsion in three-dimensional quadratic band touching Luttinger semimetals | We study superconductivity driven by screened Coulomb repulsion in
three-dimensional Luttinger semimetals with a quadratic band touching and
strong spin-orbit coupling. In these semimetals, the Cooper pairs are formed by
spin-3/2 fermions with non-trivial wavefunctions. We numerically solve the
linear Eliashberg equati... | 1910.04189v2 |
2012-09-19 | Revealing the spin and symmetry properties of the buried Co2MnSi/MgO interface by low energy spin-resolved photoemission | We present a novel approach to study the spin and symmetry electronic
properties of buried interfaces using low-energy spin-resolved photoemission
spectroscopy. We show that this method is sensitive to interfaces buried below
more than 20ML (~4nm) MgO, providing a powerful tool for the non-destructive
characterization ... | 1209.4368v1 |
2012-09-25 | A p-type Heusler compound: Growth, structure, and properties of epitaxial thin NiYBi films on MgO(100) | Epitaxial semiconducting NiYBi thin films were directly prepared on MgO(100)
substrates by magnetron sputtering. The intensity ratio of the (200) and (400)
diffraction peaks, I(200)/I(400) = 2.93, was close to the theoretical value
(3.03). The electronic structure of NiYBi was calculated using WIEN2k and a
narrow indir... | 1209.5707v1 |
2012-09-25 | Electronic and crystalline structures of zero band-gap PdLuBi thin films grown epitaxially on MgO(100) | Thin films of the proposed topological insulator PdLuBi - a Heusler compound
with the C1b structure - were prepared on Ta-Mo-buffered MgO(100) substrates by
co-sputtering from PdBi2 and Lu targets. Epitaxial growth of high-quality
PdLuBi films was confirmed by X-ray spectrometry and reflection high-energy
electron diff... | 1209.5710v1 |
2014-06-25 | Magnetic structure of GdBiPt: A candidate antiferromagnetic topological insulator | A topological insulator is a state of matter which does not break any
symmetry and is characterized by topological invariants, the integer
expectation values of non-local operators. Antiferromagnetism on the other hand
is a broken symmetry state in which the translation symmetry is reduced and
time reversal symmetry is... | 1406.6663v1 |
2018-02-20 | Thermoelectricity in correlated narrow-gap semiconductors | We review many-body effects, their microscopic origin, as well as their
impact onto thermoelectricity in correlated narrow-gap semiconductors. Members
of this class---such as FeSi and FeSb$_2$---display an unusual temperature
dependence in various observables: insulating with large thermopowers at low
temperatures, the... | 1802.07220v1 |
2018-08-17 | Magnetic and structural properties of Co$_2$MnSi based Heusler compound | The influence of antisite disorder occupancies on the magnetic properties of
the half-metallic Co$_2$MnSi compound was studied by experimental techniques
and first-principles calculations. The neutron diffraction studies show almost
identical amount of Mn and Co disorders of 6.5\% and 7.6\%, which was found to
be in go... | 1808.05743v3 |
2018-12-05 | Majorana multipole response of topological superconductors | In contrast to elementary Majorana particles, emergent Majorana fermions
(MFs) in condensed-matter systems may have electromagnetic multipoles. We
developed a general theory of magnetic multipoles for surface helical MFs on
time-reversal-invariant superconductors. The results show that the multipole
response is governe... | 1812.01857v1 |
2018-12-18 | Optical response of Luttinger semimetals in the normal and superconducting states | We investigate the optical response properties of three-dimensional Luttinger
semimetals with the Fermi energy close to a quadratic band touching point. In
particular, in order to address recent experiments on the spectroscopy of
Pyrochlore Iridates and half-Heusler superconductors, we derive expressions for
the optica... | 1812.07555v2 |
2018-12-29 | Magnetization flip in Fe-Cr-Ga system | A systematic investigation about the structure and magnetism of Fe75-xCr25Gax
(11<x<33) and Fe50Cr50-yGay (0<y<33) series has been carried out in this work.
It shows that the parent Fe50Cr25Ga25 phase has higher tolerance for Ga
replacing Cr than replacing Fe atoms. An abrupt flip of Curie temperature and
magnetization... | 1812.11304v1 |
2020-05-07 | Exchange-correlation corrections for electronic properties of half-metallic Co$_2$FeSi and nonmagnetic semiconductor CoFeTiAl | We consider two cobalt-based full-Heusler compounds CoFeTiAl and Co$_2$FeSi,
for which Coulomb correlation effects play an important role. Since the
standard GGA scheme does not provide a precise description of the electronic
properties near the Fermi level, we use a meta-GGA functional capable to
improve the descripti... | 2005.03383v1 |
2020-05-29 | Superconducting and Antiferromagnetic Properties of Dual-Phase V$_3$Ga | The binary compound V$_3$Ga can exhibit two near-equilibrium phases,
consisting of the A15 structure that is superconducting, and the Heusler D0$_3$
structure that is semiconducting and antiferromagnetic. Density functional
theory calculations show that the two phases are closely degenerate, being
separated by only ~10... | 2005.14348v1 |
2020-08-04 | Ultra-High Thermoelectric Power Factors in Narrow Gap Materials with Asymmetric Bands | We theoretically unveil the unconventional possibility to achieve extremely
high thermoelectric power factors in lightly doped narrow gap semiconductors
with asymmetric conduction/valence bands operated in the bipolar transport
regime. Specifically, using Boltzmann transport simulations, we show that
narrow bandgap mat... | 2008.01359v1 |
2020-08-26 | Field-induced magnetic phase transitions and the resultant giant anomalous Hall effect in antiferromagnetic half-Heusler DyPtBi | We report field-induced magnetic phase transitions and transport properties
of antiferromagnetic DyPtBi. We show that DyPtBi hosts a delicate balance
between two different magnetic ground states, which can be controlled by a
moderate magnetic field. Furthermore, it exhibits giant anomalous Hall effect
(\sigma_A=1540 (o... | 2008.11345v1 |
2021-03-15 | Tuneable local order in thermoelectric crystals | Although crystalline solids are characterized by their periodic structures,
some are only periodic on average and deviate on a local scale. Distinct local
orderings can exist with identical periodic structures making their differences
hidden to normal diffraction methods. Using x-ray scattering we investigate the
therm... | 2103.08543v1 |
2017-06-01 | Materials Screening for the Discovery of New Half-Heuslers: Machine Learning versus Ab Initio Methods | Machine learning (ML) is increasingly becoming a helpful tool in the search
for novel functional compounds. Here we use classification via random forests
to predict the stability of half-Heusler (HH) compounds, using only
experimentally reported compounds as a training set. Cross-validation yields an
excellent agreemen... | 1706.00192v1 |
2017-10-25 | Site occupancy, composition and magnetic structure dependencies of martensitic transformation in Mn$_{2}$Ni$_{1+x}$Sn$_{1-x}$ | A delicate balance between various factors such as site occupancy,
composition and magnetic ordering seems to affect the stability of the
martensitic phase in Mn$_{2}$Ni$_{1+x}$Sn$_{1-x}$. Using first-principles DFT
calculations, we explore the impacts of each one of these factors on the
martensitic stability of this s... | 1710.09093v1 |
2018-04-09 | Canted antiferromagnetism in phase-pure CuMnSb | We report the low-temperature properties of phase-pure single crystals of the
half-Heusler compound CuMnSb grown by means of optical float-zoning. The
magnetization, specific heat, electrical resistivity, and Hall effect of our
single crystals exhibit an antiferromagnetic transition at $T_{\mathrm{N}} =
55~\mathrm{K}$ ... | 1804.03223v1 |
2018-04-25 | High $n$-type thermoelectric power factor and efficiency in Ba$_{2}$BiAu from a highly dispersive band | Using first-principles density-functional theory calculations, we predict the
potential for unprecedented thermoelectric efficiency $zT=5$ at 800 K in
$n$-type Ba$_{2}$BiAu full-Heusler compound. Such a high efficiency arises from
an intrinsically ultralow lattice thermal conductivity coupled with a very high
power fac... | 1804.09392v2 |
2019-09-26 | The study of magnetic topological semimetals by first principles calculations | Magnetic topological semimetals (TSMs) are topological quantum materials with
broken time-reversal symmetry (TRS) and isolated nodal points or lines near the
Fermi level. Their topological properties would typically reveal from the
bulk-edge correspondence principle as nontrivial surface states such as Fermi
arcs or dr... | 1909.11999v1 |
2019-12-11 | Chirality-induced linear response properties in non-coplanar Mn$_3$Ge | Taking the non-collinear antiferromagnetic hexagonal Heusler compound
Mn$_3$Ge as a reference system, the contributions to linear response phenomena
arising solely from the chiral coplanar and non-coplanar spin configurations
are investigated. Orbital moments, X-ray absorption, anomalous and spin Hall
effects, as well ... | 1912.05211v1 |
2020-06-29 | Spin-polarized Weyl cones and gigantic anomalous Nernst effect in ferromagnetic Heusler films | Weyl semimetals are characterized by the presence of massless band dispersion
in momentum space. When a Weyl semimetal meets magnetism, large anomalous
transport properties emerge as a consequence of its topological nature. Here,
using $in-situ$ spin- and angle-resolved photoelectron spectroscopy combined
with $ab\ ini... | 2006.15769v2 |
2020-07-04 | Impurities in 3D quadratic band-touching Luttinger semimetals : Friedel and RKKY oscillations | We investigate the response of 3D Luttinger semimetals to localized charge
and spin impurities as a function of doping. The strong spin-orbit coupling of
these materials strongly influences the Friedel oscillations and RKKY
interactions. This can be seen at short distances with an $1/r^4$ divergence of
the responses, a... | 2007.02046v2 |
2020-09-01 | Molecular beam epitaxy of the half-Heusler antiferromagnet CuMnSb | We report growth of CuMnSb thin films by molecular beam epitaxy on InAs(001)
substrates. The CuMnSb layers are compressively strained ($0.6~\text{%}$) due
to lattice mismatch. The thin films have a $\omega$ full width half max of
$7.7^{''}$ according to high resolution X-ray diffraction, and a root mean
square roughnes... | 2009.00342v1 |
2020-09-02 | Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in $^{208}$Pb | New experimental data on the neutron single-particle character of the Pygmy
Dipole Resonance (PDR) in $^{208}$Pb are presented. They were obtained from
$(d,p)$ and resonant proton scattering experiments performed at the Q3D
spectrograph of the Maier-Leibnitz Laboratory in Garching, Germany. The new
data are compared to... | 2009.01151v1 |
2020-11-13 | Large anomalous Hall angle in a topological semimetal candidate TbPtBi | The magnetotransport properties in antiferromagnetic half-Heusler single
crystals of TbPtBi, a magnetic-field-induced topological semimetal with simple
band structure, are investigated. We found that a nonmonotonic magnetic field
dependence of the anomalous Hall resistivity in a high magnetic field (B>7T),
which come f... | 2011.06864v1 |
2020-12-01 | Nanocontact vortex oscillators based on Co$_2$MnGe pseudo-spin valves | We present an experimental study of vortex dynamics in magnetic nanocontacts
based on pseudo spin valves comprising the Co$_2$MnGe Heusler compound. The
films were grown by molecular beam epitaxy, where precise stoichiometry control
and tailored stacking order allowed us to define the bottom ferromagnetic layer
as the ... | 2012.00522v3 |
2020-12-04 | Growth, strain and spin orbit torques in epitaxial NiMnSb films sputtered on GaAs | We report current-induced spin torques in epitaxial NiMnSb films on a
commercially available epi-ready GaAs substrate. The NiMnSb was grown by
co-sputtering from three targets using optimised parameter. The films were
processed into micro-scale bars to perform current-induced spin-torque
measurements. Magnetic dynamics... | 2012.02568v4 |
2020-12-11 | Absence of superconductivity in topological metal ScInAu$_2$ | The Heusler compound ScInAu$_2$ was previously reported to have a
superconducting ground state with a critical temperature of 3.0 K. Recent high
throughput calculations have also predicted that the material harbors a
topologically non-trivial band structure similar to that reported for
beta-PdBi$_2$. In an effort to ex... | 2012.06501v1 |
2020-12-12 | Ultra-fast Double Pulse All-Optical Re-switching of a Ferrimagnet | All-optical re-switching has been investigated in the half-metallic Heusler
ferrimagnet Mn2Ru0.9Ga, where Mn atoms occupy two inequivalent sites in the
XA-type structure. The effect of a second 200 fs 800 nm pump pulse that follows
a first pulse, when both are above the threshold for switching, is studied as a
function... | 2012.06823v1 |
2020-12-29 | Magnetotransport signatures of chiral magnetic anomaly in the half-Heusler phase ScPtBi | Study of magnetotransport properties of ScPtBi revealed simultaneously: a
negative contribution to the longitudinal magnetoresistance, the planar Hall
effect, and distinct angular narrowing of the longitudinal magnetoresistance {
three hallmarks of chiral magnetic anomaly (pumping of axial charge between
Weyl nodes), a... | 2012.14819v2 |
2021-06-03 | Quaternary-digital data storage based on magnetic bubbles in anisotropic materials | The topologically non-trivial nano-whirls, called magnetic skyrmions, are
often considered attractive for spintronic applications like the racetrack data
storage device. However, skyrmions do not move parallel to applied currents and
typically do not coexist with other nano-objects, making the realization of
such stora... | 2106.01747v2 |
2021-06-24 | Structure and magnetism in Fe-doped FeVSb and epitaxial Fe/FeVSb nanocomposite films | The combination of ferromagnetism and semiconducting behavior offers an
avenue for realizing novel spintronics and spin-enhanced thermoelectrics. Here
we demonstrate the synthesis of doped and nanocomposite half Heusler
Fe$_{1+x}$VSb films by molecular beam epitaxy. For dilute excess Fe ($x <
0.1$), we observe a decrea... | 2106.13165v1 |
2022-05-17 | Cubic magneto-optic Kerr effect in Ni(111) thin films with and without twinning | In most studies utilizing the magneto-optic Kerr effect (MOKE), the detected
change of polarized light upon reflection from a magnetized sample is supposed
to be proportional to the magnetization $\boldsymbol{M}$. However, MOKE
signatures quadratic in $\boldsymbol{M}$ have also been identified and
utilized, e.g., to se... | 2205.08298v2 |
2022-09-10 | First-principles analysis of intravalley and intervalley electron-phonon scattering in thermoelectric materials | Intervalley collisions, which scatter electrons from one valley or band to
another, can be detrimental to thermoelectric performance in materials with
multiple valleys/bands. In this study, density functional theory is used to
investigate the electron-phonon scattering characteristics of three lead
chalcogenides (PbS, ... | 2209.04659v1 |
2022-11-14 | Coactive-Staggered Feature in Weyl Materials for Enhancing the Anomalous Nernst Conductivity | Power generation through the anomalous Nernst effect in topological Weyl
materials has several advantages over conventional thermoelectrics due to the
transverse geometry. However, the magnitude of the anomalous Nernst
conductivity (ANC) in most known materials is too small to be of practical use,
and there exist few g... | 2211.07773v1 |
2022-12-09 | Modelling assisted tunneling on the Bloch sphere using the Quantum Composer | The Bloch sphere representation is a geometric model for all possible quantum
states of a two-level system that can be used to describe the time dynamics of
a qubit. As explicit application, we consider the time dynamics of a particle
in a double-well potential. In particular, we adopt a recent method for
off-resonant ... | 2212.04845v3 |
2022-12-31 | An implementation of the density functional perturbation theory in the PAW framework | Quantifying materials' dynamical responses to external electromagnetic fields
is central to understanding their physical properties. Here we present an
implementation of the density functional perturbation theory for the
computation of linear susceptibilities using the projector augmented-wave
method. The Sternheimer e... | 2301.00143v1 |
2023-02-14 | Perspective: strain and strain gradient engineering in membranes of quantum materials | Strain is powerful for discovery and manipulation of new phases of matter;
however, the elastic strains accessible to epitaxial films and bulk crystals
are typically limited to small ($<2\%$), uniform, and often discrete values.
This Perspective highlights new directions for strain and strain gradient
engineering in fr... | 2302.07390v1 |
2023-12-14 | Defect formation energy, electronic structure and phonon dispersion study of half-Heusler TiSnX (X = Pd, Pt and Ni): an ab initio approach | In order to obtain reliable and close to the experimental transport
properties, it is necessary to have a good description of the structural,
electronic and vibrational properties of the materials. In this regard, the
defect formation plays a crucial hole, specially when it has a small formation
energy. In this study w... | 2312.09186v1 |
2024-02-28 | Symmetry-breaking normal state response and surface superconductivity in topological semimetal YPtBi | Most of the half-Heusler RPtBi compounds (R=rare earth) host various surface
states due to spin-orbit coupling driven topological band structure. While
recent ARPES measurements ubiquitously reported the existence of surface states
in RPtBi, their evidence by other experimental techniques remains elusive. Here
we repor... | 2402.18735v1 |
2000-01-07 | ^{27}Al Impurity-Satellite NMR and Non-Fermi-Liquid Behavior in U_{1-x}Th_xPd_2Al_3 | Non-Fermi-liquid (NFL) behavior in the f-sublattice-diluted alloy system
U_{1-x}Th_xPd_2Al_3 has been studied using ^{27}Al nuclear magnetic resonance
(NMR). Impurity satellites due to specific U near-neighbor configurations to
^{27}Al sites are clearly resolved in both random and field-aligned powder
samples. The spat... | 0001078v1 |
2000-05-23 | Systematic study of Ga$_{1-x}$In$_x$As self-assembled quantum wires with different interfacial strain relaxation | A systematic theoretical study of the electronic and optical properties of
Ga$_{1-x}$In$_x$As self-assembled quantum-wires (QWR's) made of short-period
superlattices (SPS) with strain-induced lateral ordering is presented. The
theory is based on the effective bond-orbital model (EBOM) combined with a
valence-force fiel... | 0005392v1 |
2003-03-10 | Nitrogen local electronic structure in Ga(In)AsN alloys by soft-X-ray absorption and emission: Implications for optical properties | Soft-X-ray emission and absorption spectroscopies with their elemental
specificity are used to determine the local electronic structure of N atoms in
Ga(In)AsN diluted semiconductor alloys (N concentrations about 3%) in view of
applications of such materials in optoelectronics. Deviations of the N local
electronic stru... | 0303163v3 |
2003-11-25 | Evolution of Superconductivity and Charge Density Wave Ordering in the Lu$_5$Ir$_4$(Si$_{1-x}$Ge$_x$)$_{10}$ Alloy System | The compounds Lu$_5$Ir$_4$Si$_{10}$ and Lu$_5$Ir$_4$Ge$_{10}$ crystallize in
the tetragonal Sc$_5$Co$_4$Si$_{10}$ type structure. Lu$_5$Ir$_4$Si$_{10}$ is
known to superconduct below 3.9 K and it also exhibits a strongly coupled
charge density wave (CDW) transition below 83 K. Lu$_5$Ir$_4$Ge$_{10}$
undergoes a transiti... | 0311590v1 |
2004-04-07 | Quantitative Phase Field Model of Alloy Solidification | We present a detailed derivation and thin interface analysis of a phase-field
model that can accurately simulate microstructural pattern formation for
low-speed directional solidification of a dilute binary alloy. This advance
with respect to previous phase-field models is achieved by the addition of a
phenomenological... | 0404164v2 |
2005-08-24 | Compositional disorder and its influence on the structural, electronic and magnetic properties of MgC(Ni_{1-x}Co_{x})_{3} alloys using first-principles | First-principles, density-functional based electronic structure calculations
are carried out for MgC(Ni_{1-x}Co_{x})_{3} alloys over the concentration range
0\leq x\leq1, using Korringa-Kohn-Rostoker coherent-potential approximation
(KKR CPA) method in the atomic sphere approximation (ASA). The self-consistent
calculat... | 0508569v2 |
2006-01-25 | The wave model of martensite growth for the FCC-BCC transformation of iron-based alloys | This book is the first monograph in the scientific literature, dedicated to
the FCC-BCC transformation in iron-based alloys, in which the dynamical
approach is used for the explanation of the martensite growth stage.
The rapid growth of a cooling martensite crystal is considered as a
self-organized process controlled... | 0601569v4 |
2006-04-14 | Phonons in disordered alloys : a multiple scattering approach | In this paper we shall discuss the effect of disorder induced configuration
fluctuations on single particle and two-particle phonon Green functions in
substitutional random binary alloys. The randomness of the system will be dealt
within the augmented space theorem, introduced by one of us [J. Phys. C : Solid
State Phy... | 0604373v2 |
2006-05-09 | Interplay of order-disorder phenomena and diffusion in rigid binary alloys: Monte Carlo simulations of the two-dimensional ABV model | Transport phenomena are studied for a binary (AB) alloy on a rigid square
lattice with nearest-neighbor attraction between unlike particles, assuming a
small concentration $c_v$ of vacancies $V$ being present, to which $A(B)$
particles can jump with rates $\Gamma_A (\Gamma_B)$ in the case where the
nearest neighbor att... | 0605241v1 |
2006-07-14 | High-dielectric constant and wide band gap inverse silver oxide phases of the ordered ternary alloys of SiO$_{2}$, GeO$_{2}$ and SnO$_{2}$ | High-dielectric constant and wide band gap oxides have important
technological applications. The crystalline oxide polymorphs having lattice
constant compatibility to silicon are particularly desirable. One recently
reported candidate is the inverse silver oxide phase of SiO$_2$.
First-principles study of this system t... | 0607353v2 |
2006-08-02 | Solid-Liquid Phase Diagrams for Binary Metallic Alloys: Adjustable Interatomic Potentials | We develop a new approach to determining LJ-EAM potentials for alloys and use
these to determine the solid-liquid phase diagrams for binary metallic alloys
using Kofke's Gibbs-Duhem integration technique combined with semigrand
canonical Monte Carlo simulations. We demonstrate that it is possible to
produce a wide-rang... | 0608039v3 |
2006-09-21 | Evolution of ferromagnetic order in URhGe alloyed with Ru, Co and Si | We have investigated the evolution of ferromagnetic order in the correlated
metal URhGe (Curie temperature $T_{\rm C} = $9.5 K) by chemical substitution of
Ru, Co and Si. Polycrystalline samples URh$_{1-x}$Ru$_x$Ge ($x \leq $0.6),
URh$_{1-x}$Co$_x$Ge ($x \leq $0.9) and URhGe$_{1-x}$Si$_x$ ($x \leq $0.2) have
been prepa... | 0609557v2 |
2006-10-25 | Spontaneous ordering as an intrinsic effect at the mesoscopic scale: A vibrational insight in (Zn,Be)Se by Raman scattering and first-principles calculations | The recent finding of a 1-bond->2-phonon `percolation'-type behaviour in
several random zincblende alloys, supporting an unsuspected 1-bond->2-mode
behaviour in the bond length distribution, renews interest for a discussion of
CuPt-type spontaneous ordering (CPSO) as a purely intrinsic effect. We
investigate this key i... | 0610682v3 |
2007-01-26 | Quantum transport in quasicrystals and complex metallic alloys | The semi-classical Bloch-Boltzmann theory is at the heart of our
understanding of conduction in solids, ranging from metals to semi-conductors.
Physical systems that are beyond the range of applicability of this theory are
thus of fundamental interest. This is the case of disordered systems which
present quantum interf... | 0701639v1 |
2008-01-22 | Impurity modes and effect of clustering in diluted semiconductor alloys | The variation of TO zone-center vibration spectra with concentration in mixed
zincblende-type semiconductors can be understood within a paradigm of unified
"one bond - two modes" approach, which has been recently outlined as a rather
general concept, and emerges from a number of previous experimental and
theoretical st... | 0801.3419v1 |
2009-01-09 | Experimental study of high energy electron interactions in a superconducting aluminum alloy resonant bar | Peak amplitude measurements of the fundamental mode of oscillation of a
suspended aluminum alloy bar hit by an electron beam show that the amplitude is
enhanced by a factor ~3.5 when the material is in the superconducting state.
This result is consistent with the cosmic ray observations made by the resonant
gravitation... | 0901.1220v1 |
2009-02-17 | First-principle solubilities of alkali and alkaline earth metals in Mg-B alloys | By devising a novel framework, we present a comprehensive theoretical study
of solubilities of alkali (Li, Na, K, Rb, Cs) and alkaline earth (Be, Ca, Sr,
Ba) metals in the he boron-rich Mg-B system. The study is based on
first-principle calculations of solutes formation energies in MgB$_2$, MgB$_4$,
MgB$_7$ alloys and ... | 0902.2958v1 |
2009-10-14 | Debye temperature of disordered bcc-Fe-Cr alloys | Debye temperature, TD, of Fe100-xCrx disordered alloys with 0<x<99.9 was
determined from the temperature dependence of the centre shift of 57Fe
Mossbauer spectra recorded in the temperature range of 80-300K. Its
compositional dependence shows an interesting non-monotonous behaviour. For
0<x<~45 as well as for ~75<x<~95... | 0910.2544v1 |
2010-09-14 | Composite THz materials using aligned metallic and semiconductor microwires, experiments and interpretation | We report fabrication method and THz characterization of composite films
containing either aligned metallic (tin alloy) microwires or chalcogenide
As2Se3 microwires. The microwire arrays are made by stack-and-draw fiber
fabrication technique using multi-step co-drawing of low-melting-temperature
metals or semiconductor... | 1009.2658v1 |
2011-01-01 | Signature effects of spin clustering and distribution of spin couplings on magnetization behaviour in Ni-Fe-Mo and Ni-Fe-W alloys | The spontaneous magnetization as a function of temperature is investigated
for a number of disordered Ni-Fe-Mo and Ni-Fe-W alloys using superconducting
quantum interference device magnetometry, with a focus on the low-T behavior as
well as the critical exponents associated with the magnetic phase transition.
While the ... | 1101.0343v2 |
2011-07-06 | Factors controlling the energetics of the oxygen reduction reaction on the Pd-Co electro-catalysts: Insight from first principles | We report here results of our density functional theory based computational
studies of the electronic structure of the Pd-Co alloy electrocatalysts and
energetics of the oxygen reduction reaction (ORR) on their surfaces. The
calculations have been performed for the (111) surfaces of pure Pd,
Pd0.75Co0.25 and Pd0.5Co0.5... | 1107.1231v1 |
2011-09-09 | Study of ageing in Al-Mg-Si alloys by positron annihilation spectroscopy | In many common Al-Mg-Si alloys (6000 series) intermediate storage at or near
'room temperature' after solutionising leads to pronounced changes of the
precipitation kinetics during the ensuing artificial ageing step at \approx
180{\deg}C. This is not only an annoyance in production, but also a challenge
for researchers... | 1109.2019v2 |
2011-09-26 | Instability types at ion-assisted alloy deposition: from two-dimensional to three-dimensional nanopattern growth | Ion irradiation during film growth has a strong impact on structural
properties. Linear stability analysis is employed to study surface
instabilities during ion-assisted growth of binary alloys. An interplay between
curvature-dependent ion-driven and deposition-driven instabilities is
investigated. We demonstrate that ... | 1109.5461v3 |
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