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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 |
2011-10-10 | Ab-initio calculation of effective exchange interactions, spin waves, and Curie temperature in L2_1- and L1_2-type local moment ferromagnets | Employing first-principles electronic structure calculations in conjunction
with the frozen-magnon method we study the effective exchange interactions and
spin waves in local moment ferromagnets. As prototypes we have chosen three
L2$_1$-type full Heusler alloys Cu$_2$MnAl, Ni$_2$MnSn and Pd$_2$MnSn, and the
L1$_2$-typ... | 1110.2156v1 |
2014-05-19 | Low-Dimensional Transport and Large Thermoelectric Power Factors in Bulk Semiconductors by Band Engineering of Highly Directional Electronic States | Thermoelectrics are promising to address energy issues but their exploitation
is still hampered by low efficiencies. So far, much improvement has been
achieved by reducing the thermal conductivity but less by maximizing the power
factor. The latter imposes apparently conflicting requirements on the band
structure: a na... | 1405.4685v3 |
2015-06-29 | Giant magnetocaloric effect from reverse martensitic transformation in Ni-Mn-Ga-Cu ferromagnetic shape memory alloys | In an effort to produce Giant Magnetocaloric effect (GMCE) near room
temperature, in a first ever such study, the austenite transformation
temperature (As) was fine tuned to ferromagnetic Curie temperature (TC) in
Ferromagnetic Shape Memory Alloys (FSMA) and a large GMCE of delta-SM = - 81.75
J/Kg-K was achieved in Ni5... | 1506.08709v2 |
2018-05-16 | Thermoelectric Alchemy: Designing A Chemical Analog to PbTe with Intrinsic High Band Degeneracy and Low Lattice Thermal Conductivity | Improving the figure of merit $zT$ of thermoelectric materials requires
simultaneously a high power factor and low thermal conductivity. An effective
approach for increasing the power factor is to align the band extremum and
achieve high band degeneracy ($\geq$ 12) near the Fermi level as realized in
PbTe [\textcolor{b... | 1805.06433v1 |
2018-06-18 | AFLOW-CHULL: Cloud-oriented platform for autonomous phase stability analysis | $\textit{A priori}$ prediction of phase stability of materials is a
challenging practice, requiring knowledge of all energetically-competing
structures at formation conditions. Large materials repositories
$\unicode{x2014}$ housing properties of both experimental and hypothetical
compounds $\unicode{x2014}$ offer a pat... | 1806.06901v1 |
2018-09-19 | Exploring the best scenario for understanding the high temperature thermoelectric behaviour of Fe2VAl | Heusler-type Fe2VAl compound is a promising thermoelectric candidate with
non-magnetic ground state. The present work investigates the Seebeck
coefficient (S) of Fe2VAl in the temperature region 300 to 620 K with the help
of experimental and theoretical tools. The experimental value of S is observed
-130 {\mu}V/K at 30... | 1809.07015v1 |
2019-04-10 | Non-trivial topological valence bands of common diamond and zinc-blende semiconductors | The diamond and zinc-blende semiconductors are well-known and have been
widely studied for decades. Yet, their electronic structure still surprises
with unexpected topological properties of the valence bands. In this joint
theoretical and experimental investigation we demonstrate for the benchmark
compounds InSb and Ga... | 1904.05063v1 |
2016-03-03 | Room-temperature magnetic topological semimetal state in half-metallic Heusler Co$_2$TiX (X=Si, Ge, or Sn) | Topological semimetals (TSMs) including Weyl semimetals and nodal-line
semimetals are expected to open the next frontier of condensed matter and
materials science. Although the first inversion breaking Weyl semimetal was
recently discovered in TaAs, its magnetic counterparts, i.e., the time-reversal
breaking Weyl and n... | 1603.01255v3 |
2020-07-27 | Role of magnetic exchange interactions in chiral-type Hall effects of epitaxial Mn$_{x}$PtSn films | Tetragonal Mn-based Heusler compounds feature rich exchange interactions and
exotic topological magnetic textures, such as antiskyrmions, complimented by
the chiral-type Hall effects. This makes the material class interesting for
device applications. We report the relation of the magnetic exchange
interactions to the t... | 2007.13412v1 |
2022-04-19 | Thermoelectric properties of Fe$_{2}$VAl at high temperature region: A combined experimental and theoretical study | Heusler type compounds have long been recognized as potential thermoelectric
(TE) materials. Here, the experimentally observed TE properties of Fe$_{2}$VAl
are understood through electronic structure calculations in the temperature
range of $300-800$ K. The observed value of $S$ is $\sim-$138 $\mu$V/K at 300
K. Then, t... | 2204.08654v1 |
2005-04-20 | First-principles study of thin magnetic transition-metal silicide films on Si(001) | In order to combine silicon technology with the functionality of magnetic
systems, a number of ferromagnetic (FM) materials have been suggested for the
fabrication of metal/semiconductor heterojunctions. In this work, we present a
systematic study of several candidate materials in contact with the Si surface.
We employ... | 0504515v2 |
2017-08-25 | Topological superconductivity of spin-3/2 carriers in a three-dimensional doped Luttinger semimetal | We investigate topological Cooper pairing, including gapless Weyl and fully
gapped class DIII superconductivity, in a three-dimensional doped Luttinger
semimetal. The latter describes effective spin-3/2 carriers near a quadratic
band touching and captures the normal-state properties of the 227 pyrochlore
iridates and h... | 1708.07825v2 |
2019-07-05 | Thermoelectric transport trends in group 4 half-Heusler alloys | The thermoelectric properties of 54 different group 4 half-Heusler (HH)
alloys have been studied from first principles. Electronic transport was
studied with density functional theory using hybrid functionals facilitated by
the $\mathbf{k} \cdot \mathbf{p}$ method, while the temperature dependent
effective potential me... | 1907.02845v1 |
2021-11-02 | Microstructure engineering of metamagnetic Ni-Mn-based Heusler compounds by Fe-doping: A roadmap towards excellent cyclic stability combined with large elastocaloric and magnetocaloric effects | Ni-Mn-based metamagnetic shape-memory alloys exhibit a giant thermal response
to magnetic fields and uniaxial stress which can be utilized in single caloric
or multicaloric cooling concepts for energy-efficient and sustainable
refrigeration. However, during cyclic operation these alloys suffer from
structural and funct... | 2111.01621v2 |
2022-06-22 | Non-trivial topological phases in transition metal rich half-Heusler Oxides | Topological Insulators with gapless surface states and insulating bulk in
non-centrosymmetric cubic systems have been extensively explored following the
discovery of two-dimensional quantum spin hall effect in zincblende HgTe. In
such systems the negative band inversion strength E$_{BIS}$ ($=$ E$_{\Gamma_6}
-$ E$_{\Gam... | 2206.10976v2 |
2023-09-14 | Composition and Structure Based GGA Bandgap Prediction Using Machine Learning Approach | This study focuses on developing precise machine learning (ML) regression
models for predicting energy bandgap values based on chemical compositions and
crystal structures. The primary aim is to match the accuracy of predictions
derived from GGA-PBE calculations and validate them through density functional
theory (DFT)... | 2309.07424v1 |
2011-06-24 | Magnetic dichroism in angular-resolved hard X-ray photoelectron spectroscopy from buried layers | This work reports the measurement of magnetic dichroism in angular-resolved
photoemission from in-plane magnetized buried thin films. The high bulk
sensitivity of hard X-ray photoelectron spectroscopy (HAXPES) in combination
with circularly polarized radiation enables the investigation of the magnetic
properties of bur... | 1106.4976v1 |
2012-01-30 | Insights into the electronic structure of Co2FeSi from x-ray magnetic linear dichroism | Experimental evidence both for and against a half-metallic ground-state of
the Heusler compound Co2FeSi has been published. Density functional theory
based calculations suggest a non half-metallic ground state. It has been
argued, that on-site Coulomb interaction of the d electrons has to be taken
into account via the ... | 1201.6263v2 |
2012-03-13 | Stabilization of Majorana modes in vortices in the superconducting phase of topological insulators using topologically trivial bands | If superconductivity is induced in the metallic surface states of topological
insulators via proximity, Majorana modes will be trapped on the vortex cores.
The same effects hold for doped topological insulators which become bulk s-wave
superconductors as long as the doping does not exceed a critical values $
\mu^{\pm}_... | 1203.2958v2 |
2013-11-21 | Effect of annealing on spinodally decomposed Co2CrAl grown via floating zone technique | Among the large class of Heusler compounds, Co2CrAl is predicted to be 100 %
spin polarized and is hence, a potential candidate for application in
spintronics. So far, the predicted properties have not been experimentally
realized which may be attributed to the phase segregated nature of samples.
This phase segregation... | 1311.5453v1 |
2015-01-16 | State of Co and Mn in half-metallic ferromagnet Co$_2$MnSi explored by magnetic circular dichroism in hard X-ray photoelectron emission and soft X-ray absorption spectroscopies | The half-metallic Heusler compound Co$_2$MnSi is a very attractive material
for spintronic devices because it exhibits very high tunnelling
magnetoresistance ratios. This work reports on a spectroscopic investigation of
thin Co$_2$MnSi films as they are used as electrodes in magnetic tunnel
junctions. The investigated ... | 1501.03966v1 |
2016-11-28 | Synthesis of low-moment CrVTiAl: a potential room temperature spin filter | The efficient production of spin-polarized currents at room temperature is
fundamental to the advancement of spintronics. Spin-filter materials ---
semiconductors with unequal band gaps for each spin channel --- can generate
spin-polarized current without the need for spin-polarized contacts. In
addition, a spin-filter... | 1611.09307v3 |
2017-07-11 | Unconventional Superconductivity in Luttinger Semimetals: Theory of Complex Tensor Order and the Emergence of the Uniaxial Nematic State | We investigate unconventional superconductivity in three-dimensional
electronic systems with the chemical potential close to a quadratic band
touching point in the band dispersion. Short-range interactions can lead to
d-wave superconductivity, described by a complex tensor order parameter. We
elucidate the general stru... | 1707.03444v2 |
2017-11-30 | Topological Hopf and chain link semimetal states and their application to Co2MnGa (Theory and Materials Prediction) | Topological semimetals can be classified by the connectivity and
dimensionality of the band cross- ing in momentum space. The band crossings of
a Dirac, Weyl, or an unconventional fermion semimet- al are 0D points, whereas
the band crossings of a nodal-line semimetal are 1D closed loops. Here we
propose that the presen... | 1712.00055v1 |
2018-11-09 | Topological d+s wave superconductors in a multi-orbital quadratic band touching system | Realization of topological superconductors is one of the most important goals
in studies of topological phases in quantum materials. In this work, we
theoretically propose a novel way to attain topological superconductors with
non-trivial Fermi surfaces of Bogoliubov quasiparticles. Considering the
interacting Luttinge... | 1811.04046v1 |
2018-11-10 | Magnetic Order and Lattice Instabilities in Ni$_{2}$Mn$_{1+x}$Sn$_{1-x}$ Heusler based Magnetic Shape-Memory Alloys | The magnetic correlations in the austenite phase and the consequent
martensitic transition in inverse magnetocaloric alloys,
Ni$_{2}$Mn$_{1+x}$Sn$_{1-x}$, have been a matter of debate for decades. We
conclusively establish using {\it ab initio} phonon calculations that the spin
alignment of excess Mn at the Sn site (Mn... | 1811.04221v1 |
2018-11-12 | Large anomalous Hall and Nernst effect from nodal line symmetry breaking in Fe$_2$MnX (X=P,As,Sb) | A large Berry curvature in the vicinity of the Fermi energy is required in
order to obtain a large anomalous Hall and Nernst effect. This Berry curvature
can be induced by Weyl points and gapped nodal lines. One of the possible
mechanisms takes place in systems with a symmetry group where mirror planes
lead to protecte... | 1811.04680v1 |
2018-07-06 | Strategic enhancement of anomalous Nernst effect in Co2MnAl1-xSix Heusler compounds | The anomalous Nernst effect (ANE), a thermoelectric phenomenon in magnetic
materials, has potential for novel energy harvesting applications because its
orthogonal relationship between the temperature gradient and the electric field
enables us to utilize the large area of non-flat heat sources. In this study,
the requi... | 1807.02209v3 |
2018-07-17 | Large anomalous Nernst effect in thin films of the Weyl semimetal Co2MnGa | The magneto-thermoelectric properties of Heusler compound thin films are very
diverse. Here, we discuss the anomalous Nernst response of Co$_2$MnGa thin
films. We systematically study the anomalous Nernst coefficient as a function
of temperature, and we show that unlike the anomalous Hall effect, the
anomalous Nernst e... | 1807.06487v1 |
2018-07-20 | Characterization of topological band structures away from the Fermi level by anomalous Nernst measurements | Resolving the structure of energy bands in transport experiments is a major
challenge in condensed matter physics and material science. Sometimes, however,
traditional electrical conductance or resistance measurements only provide very
small signals, and thus limit the ability to obtain direct band structure
informatio... | 1807.07843v1 |
2019-04-02 | Spin pumping and spin torque in interfacial tailored Co2FeAl/\b{eta}-Ta layers | The Heusler ferromagnetic (FM) compound Co2FeAl interfaced with a high-spin
orbit coupling non-magnetic (NM) layer is a promising candidate for energy
efficient spin logic circuits. The circuit potential depends on the strength of
angular momentum transfer across the FM/NM interface; hence, requiring low spin
memory lo... | 1904.01506v3 |
2022-03-04 | In-situ nitriding of Fe2VAl during laser surface remelting to manipulate microstructure and crystalline defects | Tailoring the physical properties of complex materials for targeted
applications requires optimizing the microstructure and crystalline defects
that influence electrical and thermal transport, and mechanical properties.
Laser surface remelting can be used to modify the sub-surface microstructure of
bulk materials and h... | 2203.02209v1 |
2019-05-24 | A first-principles investigation of Topological Phase Transition in face-centred cubic LiMgBi | Topological Insulators (TI) exhibit robust spin-locked dissipationless
Fermion transport along the surface states. In the current study, we use
\textit{first-principles} calculations to investigate a Topological Phase
Transition (TPT) in a Half-Heusler (HH) compound LiMgBi driven by a Volume
Expansive Pressure (VEP) wh... | 1905.10103v2 |
2019-09-04 | Exploring Disorder in the Spin Gapless Semiconductor Mn$_2$CoAl | Since the prediction of spin-gapless semiconducting behaviour in the Heusler
compound Mn$_2$CoAl, evidence of spin-gapless behaviour in thin films has
typically been inferred from magnetotransport measurements. The spin gapless
state is however fragile, and further, band structure calculations indicate
that even a smal... | 1909.02153v1 |
2019-12-13 | Shallow impurity band in ZrNiSn | ZrNiSn and related half Heusler compounds are candidate materials for
efficient thermoelectric energy conversion with a reported thermoelectric
figure-of-merit of n-type ZrNiSn exceeding unity. Progress on p-type materials
has been more limited, which has been attributed to the presence of an impurity
band, possibly re... | 1912.06539v1 |
2020-06-04 | Material Descriptors for the Discovery of Efficient Thermoelectrics | The predictive performance screening of novel compounds can significantly
promote the discovery of efficient, cheap, and non-toxic thermoelectric
materials. Large efforts to implement machine-learning techniques coupled to
materials databases are currently being undertaken, but the adopted
computational methods can dra... | 2006.02789v2 |
2021-01-29 | Room-temperature antiskyrmions and sawtooth surface textures in a noncentrosymmetric magnet with $S_4$ symmetry | Topological spin textures have attracted much attention both for fundamental
physics and spintronics applications. Among them, antiskyrmions possess a
unique spin configuration with Bloch-type and N\'eel-type domain walls due to
anisotropic Dzyaloshinskii-Moriya interaction (DMI) in the noncentrosymmetric
crystal struc... | 2101.12359v1 |
2021-10-11 | Absolute calibration of the latent heat of transition using differential thermal analysis | We describe a simple and accurate differential thermal analysis set up to
measure the latent heat of solid state materials undergoing abrupt phase
transitions in the temperature range from 77 K to above room temperature. We
report a numerical technique for the absolute calibration of the latent heat of
the transition, ... | 2110.05046v1 |
2021-11-20 | Skyrmionics in correlated oxides | While chiral magnets, metal-based magnetic multilayers, or Heusler compounds
have been considered as the material workhorses in the field of skyrmionics,
oxides are now emerging as promising alternatives, as they host special
correlations between the spin-orbital-charge-lattice degrees of freedom and/or
coupled ferroic... | 2111.10562v2 |
2021-11-28 | CoFeVSb: A Promising Candidate for Spin Valve and Thermoelectric Applications | We report a combined theoretical and experimental study of a novel quaternary
Heusler system CoFeVSb from the view point of room temperature spintronics and
thermoelectric applications. It crystallizes in cubic structure with small
DO$_3$-type disorder. The presence of disorder is confirmed by room temperature
synchrot... | 2111.14081v1 |
2022-06-06 | Quantitative theory of magnetic interactions in solids | In this report we review the method of explicit calculations of interatomic
exchange interactions of magnetic materials. This involves exchange mechanisms
normally referred to as Heisenberg exchange, Dzyaloshinskii-Moriya interaction
and anisotropic symmetric exchange. The connection between microscopic theories
of the... | 2206.02415v2 |
2022-08-24 | The type-I antiferromagnetic Weyl semimetal InMnTi$_2$ | Topological materials have been a main focus of studies in the past decade
due to their protected properties that can be exploited for the fabrication of
new devices. Among them, Weyl semimetals are a class of topological semimetals
with non-trivial linear band crossing close to the Fermi level. The existence
of such c... | 2208.11412v3 |
2022-12-05 | Quantifying nonadiabaticity in major families of superconductors | The classical Bardeen-Cooper-Schrieffer and Eliashberg theories of the
electron-phonon-mediated superconductivity are based on the Migdal theorem,
which is an assumption that the energy of charge carriers, $k{_B}T{_F}$,
significantly exceeds the phononic energy, $\hbar{\omega{_D}} $, of the
crystalline lattice. This as... | 2212.02396v3 |
2023-01-13 | Spin and current transport in the robust half-metallic magnet $c$-CoFeGe | Spintronics is an emerging form of electronics based on the electrons' spin
degree of freedom for which materials with robust half-metallic ferromagnet
(HMF) character are very attractive. Here we determine the structural
stability, electronic, magnetic, and mechanical properties of the half-Heusler
(hH) compound CoFeG... | 2301.05493v1 |
2022-08-07 | A machine learning approach to predict the structural and magnetic properties of Heusler alloy families | Random forest (RF) regression model is used to predict the lattice constant,
magnetic moment and formation energies of full Heusler alloys, half Heusler
alloys, inverse Heusler alloys and quaternary Heusler alloys based on existing
as well as indigenously prepared databases. Prior analysis was carried out to
check the ... | 2208.12705v1 |
2007-11-15 | Characterization of half-metallic L2_1-phase Co_2FeSi full-Heusler alloy films formed by rapid thermal annealing | The authors developed a preparation technique of Co_2FeSi full-Heusler alloy
films with the L2_1-ordered structure on silicon-on-insulator (SOI) substrates,
employing rapid thermal annealing (RTA). The Co_2FeSi full-Heusler alloy films
were successfully formed by RTA-induced silicidation reaction between an
ultrathin S... | 0711.2404v1 |
2013-01-25 | All-Heusler giant-magnetoresistance junctions with matched energy bands and Fermi surfaces | We present an all-Heusler architecture which could be used as a rational
design scheme for achieving high spin-filtering efficiency in the
current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) devices. A
Co2MnSi/Ni2NiSi/Co2MnSi trilayer stack is chosen as the prototype of such an
architecture, of which the e... | 1301.6106v1 |
2017-04-05 | Structure, site-specific magnetism and magneto-transport properties of epitaxial D0$_{22}$ Mn$_2$Fe$_x$Ga thin films | Ferrimagnetic Mn$_2$Fe$_x$Ga $(0.26 \leq x \leq 1.12)$ thin films have been
characterised by X-ray diffraction, SQUID magnetometry, X-ray absorption
spectroscopy, X-ray magnetic circular dichroism and M\"{o}ssbauer spectroscopy
with the aim of determining the structure and site-specific magnetism of this
tetragonal, D0... | 1704.01326v1 |
2021-06-22 | Superconductivity in spin-$3/2$ systems: symmetry classification, odd-frequency pairs, and Bogoliubov Fermi surfaces | The possible symmetries of the superconducting pair amplitude is a
consequence of the fermionic nature of the Cooper pairs. For spin-$1/2$ systems
this leads to the $\mathcal{SPOT}=-1$ classification of superconductivity,
where $\mathcal{S}$, $\mathcal{P}$, $\mathcal{O}$, and $\mathcal{T}$ refer to
the exchange operato... | 2106.11983v2 |
2021-10-26 | Spin- and time-resolved photoelectron spectroscopy and diffraction studies using time-of-flight momentum microscopes | Momentum microscopy (MM) is a novel way of performing angular-resolved
photoelectron spectroscopy (ARPES). Combined with time-of-flight (ToF) energy
recording, its high degree of parallelization is advantageous for photon-hungry
experiments like ARPES at X-ray energies and spin-resolved ARPES. This article
introduces i... | 2110.13832v2 |
2022-11-25 | Two-band conduction as a pathway to non-linear Hall effect and unsaturated negative magnetoresistance in the martensitic compound GdPd2Bi | The present work aims to address the electronic and magnetic properties of
the intermetallic compound GdPd$_2$Bi through a comprehensive study of the
structural, magnetic, electrical and thermal transport on a polycrystalline
sample, followed by theoretical calculations. Our findings indicate that the
magnetic ground s... | 2211.13982v1 |
2019-10-29 | Perpendicular magnetic anisotropy in Pt/Co-based full Heusler alloy/MgO thin films structures | Perpendicular magnetic anisotropy (PMA) in ultrathin magnetic structures is a
key ingredient for the development of electrically controlled spintronic
devices. Due to their relatively large spin-polarization, high Curie
temperature and low Gilbert damping the Co-based full Heusler alloys are of
special importance from ... | 1910.13107v1 |
2009-01-12 | Screening and Fabrication of Half-Heusler phases for thermoelectric applications | Half-Heusler phases have gained recently much interest as thermoelectric
materials. Screening of possible systems was performed by ab-initio simulation
using VASP-software. The energy-versus-Volume (E(V)) curves were calculated and
calibrated. For TiCoSb, NbNiSn, FeMoSb the stability of Half-Heusler phase
against concu... | 0901.1491v3 |
2015-07-21 | Realization of multifunctional shape-memory ferromagnets in all-d-metal Heusler phases | Heusler ferromagnetic shape-memory alloys (FSMAs) normally consist of
transition-group d-metals and main-group p-elements. Here, we report the
realization of FSMAs in Heusler phases that completely consist of d metals. By
introducing the d-metal Ti into NiMn alloys, cubic B2-type Heusler phase is
obtained and the marte... | 1507.05907v1 |
2016-08-10 | Equiatomic quaternary Heusler alloys: a material perspective for spintronic applications | Half-metallic ferromagnetic (HMF) materials show high spin polarization and
are therefore interesting to researchers due to their possible applications in
spintronic devices. In these materials, while one spin sub band has a finite
density of states at the Fermi level, the other sub band has a gap. Because of
their hig... | 1608.03088v1 |
2002-09-24 | On Order-Disorder ($L2_1 \to B2^\prime$) Phase Transition in Ni$_{2+x}Mn_{1-x}$Ga Heusler Alloys | Order-disorder phase transition in Ni$_{2+x}Mn_{1-x}$Ga Heusler alloys has
been studied. It was found that the $L2_1 \to B2^{\prime}$ phase transition in
Ni2+xMn1-xGa (x = 0.16 - 0.20) Heusler alloys is of second order and the
temperature of this transition decreases with Ni excess. | 0209547v1 |
2011-03-30 | The efficient spin injector scheme based on Heusler materials | We present the rational design scheme intended to provide the stable high
spin-polarization at the interfaces of the magneto-resistive junctions by
fulfilling the criteria of structural and chemical compatibilities at the
interface. This can be realized by joining the semiconducting and half-metallic
Heusler materials ... | 1103.5928v1 |
2015-01-16 | A first-principle study on some quanternary Heusler alloys with 4d and 3d transition metal elements | In this letter, we investigate the magnetic properties, electronic
structures, Slater-Pauling behaviours of some quanternary Heusler alloys with
4d and 3d transition metal elements. The energy levels of the minority-spin
electronic band structures for all our calculated alloys are discussed. We have
summaried 21 quante... | 1501.03871v1 |
2017-03-24 | Probing the degree of spin polarization of a ferromagnet with ferromagnet/superconductor proximity effect | Superconductor/ferromagnet proximity effect has been studied for
Pb/Co$_2$Cr$_{1-x}$Fe$_x$Al bilayers. Different substrate temperatures allowed
us to prepare the Heusler alloy Co$_2$Cr$_{1-x}$Fe$_x$Al films with different
degree of spin polarization of conduction band of the Heusler layer. We obtain
a strong correlatio... | 1703.08422v1 |
2012-02-17 | Insights into ultrafast demagnetization in pseudo-gap half metals | Interest in femtosecond demagnetization experiments was sparked by Bigot's
discovery in 1995. These experiments unveil the elementary mechanisms coupling
the electrons' temperature to their spin order. Even though first quantitative
models describing ultrafast demagnetization have just been published within the
past ye... | 1202.3874v1 |
2015-10-12 | Room-temperature spin-orbit torque in NiMnSb | Materials that crystalize in diamond-related lattices, with Si and GaAs as
their prime examples, are at the foundation of modern electronics.
Simultaneoulsy, the two atomic sites in the unit cell of these crystals form
inversion partners which gives rise to relativistic non-equilibrium spin
phenomena highly relevant fo... | 1510.03356v1 |
2016-11-14 | Phase diagram of electronic systems with quadratic Fermi nodes in $2<d<4$: $2+ε$ expansion, $4-ε$ expansion, and functional renormalization group | Several materials in the regime of strong spin-orbit interaction such as
HgTe, the pyrochlore iridate Pr$_2$Ir$_2$O$_7$, and the half-Heusler compound
LaPtBi, as well as various systems related to these three prototype materials,
are believed to host a quadratic band touching point at the Fermi level.
Recently, it has ... | 1611.04594v2 |
2017-07-12 | Superconductivity in three-dimensional spin-orbit coupled semimetals | Motivated by the experimental detection of superconductivity in the
low-carrier density half-Heusler compound YPtBi, we study the pairing
instabilities of three-dimensional strongly spin-orbit coupled semimetals with
a quadratic band touching point. In these semimetals the electronic structure
at the Fermi energy is de... | 1707.03831v2 |
2018-01-06 | Development of half metallicity within mixed magnetic phase of Cu$_{1-x}$Co$_x$MnSb alloy | Cubic Half-Heusler Cu$_{1-x}$Co$_x$MnSb (0 $\leq$ $x$ $\leq$ 0.1) compounds
have been investigated both experimentally and theoretically for their
magnetic, transport and electronic properties in search of possible half
metallic antiferromagnetism. The systems (Cu,Co)MnSb are of particular interest
as the end member al... | 1801.02035v1 |
2020-09-02 | New highly-anisotropic Rh-based Heusler compound for magnetic recording | The development of high-density magnetic recording media is limited by the
superparamagnetism in very small ferromagnetic crystals. Hard magnetic
materials with strong perpendicular anisotropy offer stability and high
recording density. To overcome the difficulty of writing media with a large
coercivity, heat assisted ... | 2009.01034v1 |
2021-11-04 | Influence of microstructure on the application of Ni-Mn-In Heusler compounds for multicaloric cooling using magnetic field and uniaxial stress | Novel multicaloric cooling utilizing the giant caloric response of
Ni-Mn-based metamagnetic shape-memory alloys to different external stimuli such
as magnetic field, uniaxial stress and hydrostatic pressure is a promising
candidate for energy-efficient and environmentally-friendly refrigeration.
However, the role of mi... | 2111.03092v2 |
2022-07-12 | First-principles study of optoelectronic and thermoelectronic properties of the ScAgC half-Heusler compound | This work presents a theoretical study regarding photovoltaic (PV) &
thermoelectric (TE) applications of ScAgC. The electronic, optical and
thermoelectric properties are investigated using DFT and semi-classical
Boltzmann transport theory. DFT calculates a direct band-gap of $\sim$$0.47$
eV, while $G_{0}W_{0}$ method e... | 2207.05661v2 |
2022-09-30 | Coexisting structural disorder and robust spin-polarization in half-metallic FeMnVAl | Half-metallic ferromagnets (HMF) are on one of the most promising materials
in the field of spintronics due to their unique band structure consisting of
one spin sub-band having metallic characteristics along with another sub-band
with semiconductor-like behavior. In this work, we report the synthesis of a
novel quater... | 2209.15243v1 |
2022-10-09 | High-performance non-Fermi-liquid metallic thermoelectric materials | Searching for high-performance thermoelectric (TE) materials in the paradigm
of narrow-bandgap semiconductors has lasted for nearly 70 years and is
obviously hampered by a bottleneck of research now. Here we report on the
discovery of a few metallic compounds, TiFexCu2x-1Sb and TiFe1.33Sb, showing
the thermopower excee... | 2210.04201v1 |
2023-01-03 | Surprisingly large anomalous Hall effect and giant negative magnetoresistance in half-topological semimetals | Large intrinsic anomalous Hall effect (AHE) due to the Berry curvature in
magnetic topological semimetals is attracting enormous interest due to its
fundamental importance and technological relevance. Mechanisms resulting in
large intrinsic AHE include diverging Berry curvature in Weyl semimetals,
anticrossing nodal ri... | 2301.01074v1 |
2020-10-09 | Structural and magnetic properties of epitaxial films of CoIrMnAl equiatomic quaternary Heusler alloy designed from first-principles calculation | MgO-barrier magnetic tunnel junctions with half-metallic Heusler alloy
electrodes attracted much attentions for spintronics applications. However, a
couples of issues related to materials still remain to be resolved for
practical uses. Recently, quarterly equiatomic Heusler alloys attracted
attentions as advanced Heusl... | 2010.04369v1 |
2021-02-22 | High T$_C$ ferromagnetic inverse Heusler alloys: A comparative study of Fe$_2$RhSi and Fe$_2$RhGe | We report the results of experimental investigations on structural, magnetic,
resistivity, caloric properties of Fe$_2$RhZ (Z=Si,Ge) along with
\textit{ab-initio} band structure calculations using first principle
simulations. Both these alloys are found to crystallize in inverse Heusler
structure but with disorder in t... | 2102.10967v1 |
2004-07-21 | Orbital magnetism in the half-metallic Heusler alloys | Using the fully-relativistic screened Korringa-Kohn-Rostoker method I study
the orbital magnetism in the half-metallic Heusler alloys. Orbital moments are
almost completely quenched and they are negligible with respect to the spin
moments. The change in the atomic-resolved orbital moments can be easily
explained in ter... | 0407560v1 |
1996-07-01 | On the Uniqueness of the Papapetrou--Majumdar Metric | We establish the equality of the ADM mass and the total electric charge for
asymptotically flat, static electrovac black hole spacetimes with completely
degenerate, not necessarily connected horizon. | 9607001v1 |
2013-01-03 | Enhanced thermoelectric performance in TiNiSn-based half-Heuslers | Thermoelectric figures of merit, ZT > 0.5, have been obtained in arc-melted
TiNiSn-based ingots. This promising conversion efficiency is due to a low
lattice thermal conductivity, which is attributed to excess nickel in the
half-Heusler structure. | 1301.0419v1 |
2014-09-23 | The shifts X-Ray Mn Kα and 2p spectra of Mn-Heusler alloys | X-ray emission K{\alpha}1,2 spectra of Mn in Heusler alloys Co2MnMe (Me = Al,
Ga, Sb), Ni2MnIn, Cu2MnAl were studied. Shifts of Mn K{\alpha}1,2 lines
relatively pure Mn in high-energy region and low-energy shifts of binding
energy Mn 2p XPS is detected. X-ray emission and XPS shifts are in qualitative
agreement. | 1409.6375v1 |
2014-10-08 | Direct Measurement of Magnetocaloric Effect in Metamagnetic Ni43Mn37.9In12.1Co7 Heusler Alloy | The magnetocaloric effect in the metamagnetic Ni43Mn37.9In12.1Co7 Heusler
alloy is directly studied experimentally under the adiabatic and
quasi-isothermal conditions in a magnetic field with induction of up to 14 T. | 1410.2139v1 |
2023-02-13 | Structural, magnetic and elastic properties on stoichometric $Ni-Mn-Cu$ Heusler alloys | Heusler alloys with $Ni-Mn-Cu$ (all d-transition metal) composition have been
studied; equilibrium structures for different magnetic configurations are
found. Elastic constants and tetragonal distortion are analyzed. Distortion
effect on densities of electronic state peaks are characterized. For this
ternary family of ... | 2302.06472v2 |
2009-08-09 | Synthetic antiferromagnet with Heusler alloy Co2FeAl ferromagnetic layers | Heusler alloy Co2FeAl was employed as ferromagnetic layers in
Co2FeAl/Ru/Co2FeAl synthetic antiferromagnet structures. The experimental
results show that the structure with a Ru thickness of 0.45 nm takes on
strongly antiferromagnetic coupling, which maintains up to 150 oC annealing for
1 hour. The structure has a very... | 0908.1215v1 |
2010-02-08 | Quantitative analysis of atomic disorders in full-Heusler Co2FeSi alloy thin films using x-ray diffraction with Co-Ka and Cu-Ka sources | The authors developed a new analysis technique for atomic disorder structures
in full-Heusler alloys using x-ray diffraction (XRD) with Co-Ka and Cu-Ka
sources. The developed technique can quantitatively evaluate all the atomic
disorders for the exchanges between X, Y, and Z atoms in full-Heusler X2YZ
alloys. In partic... | 1002.1564v1 |
2013-11-08 | Electronic, magnetic and transport properties of full and half-metallic thin film Heusler alloys | The electronic and magnetic bulk properties of half-metallic Heusler alloys
such as Co$_{2}$FeSi, Co$_{2}$FeAl, Co$_{2}$MnSi and Co$_{2}$MnAl are
investigated by means of {\em ab initio} calculations in combination with Monte
Carlo simulations. The electronic structure is analyzed using the plane wave
code Quantum Espr... | 1311.1950v1 |
2014-04-17 | Large Noncollinearity and Spin Reorientation in the Novel Mn2RhSn Heusler Magnet | Noncollinear magnets provide essential ingredients for the next generation
memory technology. It is a new prospect for the Heusler materials, already well
known due to the diverse range of other fundamental characteristics. Here, we
present a combined experimental and theoretical study of novel noncollinear
tetragonal ... | 1404.4581v2 |
2015-03-10 | Vanadium sacrificial layers as a novel approach for the fabrication of freestanding Heusler Shape Memory Alloys | In this study we report a method for the preparation of freestanding
magnetocaloric thin films. Non-stoichiometric Heusler alloys Ni-Mn-Sn,
Ni-Co-Mn-Sn and Ni-Co-Mn-Al are prepared via sputter deposition. A sacrificial
vanadium layer is added between the substrate and the Heusler film. By means of
selective wet-chemica... | 1503.02987v1 |
2015-05-28 | Uncovering High Thermoelectric Figure of Merit in (Hf,Zr)NiSn Half-Heusler Alloys | Half-Heusler alloys (MgAgSb structure) are promising thermoelectric
materials. RNiSn half-Heusler phases (R=Hf, Zr, Ti) are the most studied in
view of their thermal stability. The highest dimensionless figure of merit (ZT)
obtained is ~1 in the temperature range ~450-900oC, primarily achieved in
nanostructured alloys.... | 1505.07773v2 |
2017-11-01 | Tunable magnetization relaxation of Fe_{2}Cr_{1-x}Co_{x}Si half-metallic Heusler alloys by band structure engineering | We report a systematic investigation on the magnetization relaxation
properties of iron-based half-metallic Heusler alloy
Fe$_{2}$Cr$_{1-x}$Co_${x}$Si (FCCS) thin films using broadband angular-resolved
ferromagnetic resonance. Band structure engineering through Co doping (x)
demonstrated by first-principles calculation... | 1711.00406v1 |
2018-06-13 | Minimizing hysteresis in martensite phase transforming magnetocaloric Heusler alloys | The large magnetocaloric effect in Heusler alloys showing martensite phase
transformation puts them forward as efficient materials for magnetic
refrigeration. However, irreversibility of the magnetocaloric cooling cycle is
a major challenge for real applications. This irreversibility is directly
linked to the thermal h... | 1806.05075v1 |
2018-09-04 | Increasing the performance of the superconducting spin valve using a Heusler alloy | We have studied superconducting properties of the spin-valve thin layer
heterostructures CoO$_x$/F1/Cu/F2/Cu/Pb where the ferromagnetic F1 layer was
standardly made of Permalloy whereas for the F2 layer we have taken a specially
prepared film of the Heusler alloy Co$_2$Cr$_{1-x}$Fe$_x$Al with a small degree
of spin pol... | 1809.00876v1 |
2018-12-14 | Formation of two-dimensional electron and hole gases at the interface of half-Heusler semiconductors | Heuslers are a prominent family of multi-functional materials that includes
semiconductors, half metals, topological semimetals, and magnetic
superconductors. Owing to their same crystalline structure, yet quite different
electronic properties and flexibility in chemical composition, Heusler-based
heterostructures can ... | 1812.05991v1 |
2020-04-02 | Reversible adiabatic temperature change in the shape memory Heusler alloy Ni2.2Mn0.8Ga: An effect of structural compatibility | The large magnetocaloric effect (MCE) observed in Ni-Mn based shape-memory
Heusler alloys put them forward to use in magnetic refrigeration technology. It
is associated with a first-order magnetostructural (martensitic) phase
transition. We conducted a comprehensive study of the MCE for the
off-stoichiometric Heusler a... | 2004.00949v1 |
2020-05-07 | Structural and magnetic behavior of Cr$_2$Co$_{(1-x)}$Cr$_x$Al inverse Heusler alloys | We report the structural and magnetic behavior of single phase inverse
Heusler alloys Cr$_2$Co$_{(1-x)}$Cr$_x$Al ($x = $ 0, 0.2, 0.4) using x-ray
diffraction (XRD), Raman spectroscopy, isothermal magnetization, and magnetic
susceptibility measurements. Interestingly, the Rietveld refinement of XRD data
with the space g... | 2005.03528v1 |
2016-12-19 | How to enable bulk-like martensitic transformation in epitaxial films | The present study is dedicated to the influence of different substrate and
buffer layer materials on the martensitic transformation in sputter deposited
epitaxial shape memory Heusler alloys. For this, the magnetocaloric Heusler
alloy Ni-Co-Mn-Al \cite{Teichert2015b} is grown on MgO(001),
MgAl$_{2}$O$_{4}$(001), and Mg... | 1612.06077v1 |
2017-06-14 | Temperature-dependent Gilbert damping of Co2FeAl thin films with different degree of atomic order | Half-metallicity and low magnetic damping are perpetually sought for in
spintronics materials and full Heusler alloys in this respect provide
outstanding properties. However, it is challenging to obtain the well-ordered
half-metallic phase in as-deposited full Heusler alloys thin films and theory
has struggled to estab... | 1706.04670v2 |
2021-08-04 | Theory of Huge Thermoelectric Effect Based on Magnon Drag Mechanism: Application to Thin-Film Heusler Alloy | To understand the unexpectedly high thermoelectric performance observed in
the thin-film Heusler alloy Fe$_2$V$_{0.8}$W$_{0.2}$Al, we study the magnon
drag effect, generated by the tungsten based impurity band, as a possible
source of this enhancement, in analogy to the phonon drag observed in FeSb$_2$.
Assuming that t... | 2108.01880v1 |
2022-04-13 | Influence of Co and Mn on Electronic and Magnetic properties of Ni2MnGa Heusler alloy | The ferromagnetic Heusler alloy $Ni_2MnGa$ had been of major interest in the
past few years because of its magnetic properties which can be easily tuned.
The $Ni_2MnGa$ Heusler alloys are intermetallic alloy with $L2_1$ structure.
Here we report a detailed investigation of the effect of doping of Co and Mn in
Ni2MnGa. ... | 2204.06140v4 |
2023-06-25 | First-principles study of disordered half-Heusler alloys \textit{X}Fe$_{0.5}$Ni$_{0.5}$Sn (\textit{X} = Nb, Ta) as thermoelectric prospects | High lattice thermal conductivity in half-Heusler alloys has been the major
bottleneck in thermoelectric applications. Disordered half-Heusler alloys could
be a plausible alternative to this predicament. In this paper, utilizing
first-principles simulations, we have demonstrated the low lattice thermal
conductivity in ... | 2306.14234v1 |
2021-11-09 | Effect of substitutional doping and disorder on the phase stability, magnetism, and half-metallicity of Heusler alloys | Spintronics is the fast growing field that will play a key role in optimizing
power consumption, memory, and processing capabilities of nanoelectronic
devices. Heusler alloys are potential candidates for application in spintronics
due to their room temperature (RT) half-metallicity, high Curie temperature,
low lattice ... | 2111.05179v1 |
2010-10-14 | Pressure dependence of Curie temperature and resistivity in complex Heusler alloys | Using first-principles electronic structure calculations, we have studied the
dependence of the Curie temperature on external hydrostatic pressure for random
Ni2MnSn Heusler alloys doped with Cu and Pd atoms, over the entire range of
dopant concentrations. The Curie temperatures are calculated by applying
random-phase ... | 1010.3025v2 |
2017-06-06 | Designing magnetism in Fe-based Heusler alloys: a machine learning approach | Combining material informatics and high-throughput electronic structure
calculations offers the possibility of a rapid characterization of complex
magnetic materials. Here we demonstrate that datasets of electronic properties
calculated at the ab initio level can be effectively used to identify and
understand physical ... | 1706.01840v1 |
2019-05-20 | Band alignment and scattering considerations for enhancing the thermoelectric power factor of complex materials: The case of Co-based half-Heuslers | Half-Heuslers, an emerging thermoelectric material group, has complex
bandstructures with multiple bands that can be aligned through band engineering
approaches, giving us an opportunity to improve their power factor. In this
work, going beyond the constant relaxation time approximation, we perform an
investigation of ... | 1905.07951v1 |
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