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2014-01-25 | Investigation of thermoelectric properties of half-metallic Co2 MnGe by using first principles calculations | By combining the electronic structures obtained from first principles
calculations with Boltzmann transport theory we have investigated the
electronic, magnetic and transport properties of Co$_{2}$MnGe Heusler compound.
The density of states plots, dispersion curves and total energy of paramagnetic
and ferromagnetic (F... | 1401.6511v2 |
2014-11-03 | Importance of two current model in understanding the electronic transport behavior of inverse Heusler alloy: Fe 2 CoSi | Here we explore the applicability of the two current model in understanding
the transport behavior of Fe 2 CoSi compound by using the first principles
calculations in combination with the Boltzmann transport theory. The
spin-unpolarized calculation shows large density of states (DOS) at Fermi level
(E F) and is unable ... | 1411.0367v1 |
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 |
2015-06-29 | Magnetization and magneto-transport studies on Fe$_2$VAl$_{1-x}$Si$_x$ | We report on magnetoresistance, Hall and magnetization measurements of
Fe2VAl1-xSix Heusler compounds for x= 0.005, 0.015, 0.02. There is a systematic
change in the temperature coefficient of resistance (TCR) from negative to
positive as the Si composition is increased. The Hall co-efficient shows that
the carriers are... | 1506.08516v1 |
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 |
2016-11-13 | 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 |
2017-11-07 | 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 |
2019-01-24 | Effect of secondary LuNiSn phase on thermoelectric properties of half-Heusler alloy LuNiSb | We report on the high-temperature (350 K <T< 1000 K) thermoelectric
properties of the ternary compounds LuNiSb (cubic) and LuNiSn (orthorhombic)
and a composite material (LuNiSb)$_{0.5}$(LuNiSn)$_{0.5}$. The electrical
conductivity in LuNiSn is metallic, while it is semiconducting-like in LuNiSb.
The Seebeck coefficien... | 1901.08399v1 |
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 |
2006-01-30 | Electronic structure and spectroscopy of the quaternary Heusler alloy Co$_2$Cr$_{1-x}$Fe$_{x}$Al | Quaternary Heusler alloys Co$_2$Cr$_{1-x}$Fe$_{x}$Al with varying Cr to Fe
ratio $x$ were investigated experimentally and theoretically. The electronic
structure and spectroscopic properties were calculated using the full
relativistic Korringa-Kohn-Rostocker method with coherent potential
approximation to account for t... | 0601670v1 |
2007-07-05 | Engineering the electronic, magnetic and gap-related properties of the quinternary half-metallic Heusler alloys | We review the electronic and magnetic properties of the quinternary full
Heusler alloys of the type Co$_2$[Cr$_{1-x}$Mn$_x$][Al$_{1-y}$Si$_y$] employing
three different approaches : (i) the coherent potential approximation (CPA),
(ii) the virtual crystal approximation (VCA), and (iii) supercell calculations
(SC). All t... | 0707.0728v1 |
2008-02-18 | Ab-initio determined electronic and magnetic properties of half-metallic NiCrSi and NiMnSi Heusler alloys; the role of interfaces and defects | Using state-of-the-art first-principles calculations we study the properties
of the ferromagnetic Heusler compounds NiYSi where Y stands for V, Cr or Mn.
NiCrSi and NiMnSi contrary to NiVSi are half-metallic at their equilibrium
lattice constant exhibiting integer values of the total spin magnetic moment
and thus we co... | 0802.2531v1 |
2014-08-07 | Weak Antilocalization Effect and Noncentrosymmetric Superconductivity in a Topologically Nontrivial Semimetal LuPdBi | A large number of half-Heusler compounds have been recently proposed as
three-dimensional (3D) topological insulators (TIs) with tunable physical
properties.However, no transport measurements associated with the topological
surface states have been observed in these half-Heusler candidates due to the
dominating contrib... | 1408.1543v1 |
2015-01-16 | Topological $R$PdBi half-Heusler semimetals: a new family of non-centrosymmetric magnetic superconductors | We report superconductivity and magnetism in a new family of topological
semimetals, the ternary half Heusler compounds $R$PdBi ($R$ : rare earth). In
this series, tuning of the rare earth $f$-electron component allows for
simultaneous control of both lattice density via lanthanide contraction, as
well as the strength ... | 1501.04096v3 |
2015-03-05 | Monitoring surface resonances on Co2MnSi(100) by spin-resolved photoelectron spectroscopy | The magnitude of the spin polarization at the Fermi level of ferromagnetic
materials at room temperature is a key property for spintronics. Investigating
the Heusler compound Co$_2$MnSi a value of 93$\%$ for the spin polarization has
been observed at room temperature, where the high spin polarization is related
to a st... | 1503.01573v1 |
2017-12-29 | From colossal to zero: Controlling the Anomalous Hall Effect in Magnetic Heusler Compounds via Berry Curvature Design | Since the discovery of the anomalous Hall effect (AHE), the anomalous Hall
conductivity (AHC) has been thought to be zero when there is no net
magnetization. However, the recently found relation between the intrinsic AHE
and the Berry curvature predicts other possibilities, such as a large AHC in
non-colinear antiferro... | 1712.10174v3 |
2017-04-26 | Ordering tendencies and electronic properties in quaternary Heusler derivatives | The phase stabilities and ordering tendencies in the quaternary full-Heusler
alloys NiCoMnAl and NiCoMnGa have been investigated by in-situ neutron
diffraction, calorimetry and magnetization measurements. NiCoMnGa was found to
adopt the L2$_1$ structure, with distinct Mn and Ga sublattices but a common
Ni-Co sublattice... | 1704.08100v1 |
2018-08-07 | Theoretical Investigation on the Effect of multinary Isoelectronic Substitution on TiCoSb based half-Heusler alloys | To understand the effect of isoelectronic substitution on thermoelectric
properties of TiCoSb based half - Heusler (HH) alloys, we have systematically
studied the transport properties with substitution of Zr at Ti and Bi at Sb
sites. The electronic structure of TixZr1-xCoSbxBi1-x (x = 0.25, 0.5, 0.75) and
parent TiCoSb... | 1808.02514v1 |
2020-08-28 | Effect of Bi-substitution on Structural Stability and Improved Thermoelectric Performance of p-type Half-Heusler TaSbRu: A First-principles Study | Recently, Fang et al. have predicted a high ZT of 1.54 in TaSbRu alloys at
1200 K from first-principles without considering spin-orbit interaction,
accurate electronic structure, details of phonon scattering, and
energy-dependent holes relaxation time. Here, we report the details of
structural stability and thermoelect... | 2008.12564v1 |
2016-12-22 | Co-sputtered PtMnSb thin films and PtMnSb/Pt bilayers for spin-orbit torque investigations | The manipulation of the magnetization by spin-orbit torques (SOTs) has
recently been extensively studied due to its potential for efficiently writing
information in magnetic memories. Particular attention is paid to
non-centrosymmetric systems with space inversion asymmetry, where SOTs emerge
even in single-layer mater... | 1612.07614v1 |
2017-10-06 | Relative Cooling Power Enhancement by Tuning Magneto-structural Stability in Ni-Mn-In Heusler Alloys | Off-stoichiometric Ni$_2$MnIn Heusler alloys have drawn recent attention due
to their large magnetocaloric entropy change associated with the first-order
magneto-structural transition. Here we present crystal structural, calorimetric
and magnetic studies of three compositions. Temperature-dependent X-ray
diffraction sh... | 1710.02522v6 |
2017-10-12 | Manifestation of the Berry curvature in Co2TiSn Heusler films | Various Co2 based Heusler compounds are predicted to be Weyl materials. These
systems with broken symmetry possess a large Berry curvature, and introduce
exotic transport properties. The present study on epitaxially grown Co2TiSn
films is an initial approach to understand and explore this possibility. The
anomalous Hal... | 1710.04393v1 |
2018-04-15 | $\mathrm{Co_2Fe_{1-x}Cr_xSi}$ Heusler Alloys : A promising material for spintronics application | In this article, we investigated the effect of Cr substitution in place of Fe
on the structural, magnetic and transport properties of $\mathrm{Co_2FeSi}$
alloy. A comprehensive structural analysis is done using X-ray diffraction
(XRD) and extended X-ray absorption fine structure (EXAFS) spectroscopy.
Quaternary Heusler... | 1804.05321v1 |
2019-03-26 | Complex exchange mechanism driven ferromagnetism in half-metallic Heusler Co$_{2}$TiGe: Evidence from critical behavior | We have investigated the critical phenomenon associated with the magnetic
phase transition in the half-metallic full-Heusler Co$_2$TiGe. The compound
undergoes a continuous ferromagnetic to paramagnetic phase transition at the
Curie temperature $T_{C}$=371.5 K. The analysis of magnetization isotherms in
the vicinity of... | 1903.10987v1 |
2020-10-16 | THz range Faraday rotation in the Weyl Semimetal Candidate $\mathrm{Co_2TiGe}$ | The $\mathrm{Co_2}$ family of ferromagnetic Heusler alloys have attracted
interest due to their fully spin-polarized nature, making them ideal for
applications in spintronic devices. More recently, the existence of room
temperature time-reversal-breaking Weyl nodes near the Fermi level was
predicted and confirmed in th... | 2010.08589v2 |
2020-10-22 | Multicaloric effects in Metamagnetic Heusler Ni-Mn-In under uniaxial stress and magnetic field | The world's growing hunger for artificial cold on the one hand, and the ever
more stringent climate targets on the other, pose an enormous challenge to
mankind. Novel, efficient and environmentally friendly refrigeration
technologies based on solid-state refrigerants can offer a way out of the
problems arising from cli... | 2010.11511v1 |
2021-08-15 | An ab-initio study of topological and transport properties of YAuPb | In the last few decades, the study of topological materials has been carried
out on an extensive scale. Half-Heusler alloys are well known for their
topological behaviours. In this work, we present a detailed study of
topological properties of a ternary Half-Heusler alloy, YAuPb, using the
tight-binding approach. We ha... | 2108.06678v1 |
2023-03-06 | Structural phase transitions and superconductivity in the Heusler intermetallics $X$Pd$_2$Sn ($X$ = Ti, Zr, Hf) | We report the discovery of structural phase transitions and superconductivity
in the full Heusler compounds $X$Pd$_2$Sn ($X$ = Ti, Zr, Hf), by means of
electrical transport, magnetic susceptibility, specific heat and x-ray
diffraction measurements. TiPd$_2$Sn, ZrPd$_2$Sn and HfPd$_2$Sn undergo
structural phase transiti... | 2303.02908v1 |
2023-05-25 | Optically controlling the competition between spin flips and intersite spin transfer in a Heusler half-metal on sub-100 fs timescales | The direct manipulation of spins via light may provide a path toward
ultrafast energy-efficient devices. However, distinguishing the microscopic
processes that can occur during ultrafast laser excitation in magnetic alloys
is challenging. Here, we study the Heusler compound Co2MnGa, a material that
exhibits very strong... | 2305.16455v2 |
2023-07-11 | Microstructure of a spark-plasma-sintered Fe2VAl-type Heusler alloy for thermoelectric application | The influence of microstructure on thermoelectricity is increasingly
recognized. Approaches for microstructural engineering can hence be exploited
to enhance thermoelectric performance, particularly through manipulating
crystalline defects, their structure, and composition. Here, we focus on a
full-Heusler Fe2VAl-based... | 2307.05051v1 |
2024-01-22 | Off-stoichiometric effect on magnetic and electron transport properties of Fe$_2$VAl$_{1.35}$ in respect to Ni$_2$VAl; Comparative study | Density functional theory (DFT) calculations confirm that the structurally
ordered Fe$_2$VAl Heusler alloy is nonmagnetic narrow-gap semiconductor. This
compound is apt to form various disordered modifications with high
concentration of antisite defects. We study the effect of structural disorder
on the electronic stru... | 2401.12218v1 |
2017-07-26 | Studying the effect of different exchange correlation functionals on the structural and electronic properties of a half-Heusler NaAuS compound | Theoretically, NaAuS is predicted as topological insulator, while no detail
electronic structure study has been done for this compound. Here, we report the
structural and electronic properties of NaAuS by using LDA, PBEsol, PBE and
revPBE exchange correlation functionals. The calculated values of equilibrium
lattice co... | 1707.08457v1 |
2016-11-06 | Lattice thermal conductivity of Ti$_x$Zr$_y$Hf$_{1-x-y}$NiSn half-Heusler alloys calculated from first principles: Key role of nature of phonon modes | In spite of their relatively high lattice thermal conductivity
$\kappa_{\ell}$, the XNiSn (X=Ti, Zr or Hf) half-Heusler compounds are good
thermoelectric materials. Previous studies have shown that $\kappa_{\ell}$ can
be reduced by sublattice-alloying on the X-site. To cast light on how the alloy
composition affects $\... | 1611.01757v2 |
2020-12-23 | Identifying the fingerprints of topological states by tuning magnetoresistance in a semimetal: the case of topological half-Heusler Pt1-xAuxLuSb | Topological materials often exhibit remarkably linear, non-saturating
magnetoresistance (LMR), which is both of scientific and technological
importance. However, the role of topologically non-trivial states in the
emergence of such a behaviour has eluded clear demonstration in experiments.
Here, by reducing the couplin... | 2012.12633v5 |
2003-10-16 | Magnetotransport in Single Crystal Half-Heusler Compounds | We present the results of electrical resistivity and Hall effect measurements
on single crystals of HfNiSn, TiPtSn, and TiNiSn. Semiconducting behavior is
observed in each case, involving the transport of a small number of highly
compensated carriers. Magnetization measurements suggest that impurities and
site disorder... | 0310369v2 |
2005-11-18 | Half-metallic ferromagnetism with high magnetic moment and high Curie temperature in Co$_2$FeSi | Co$_2$FeSi crystallizes in the ordered L2$_1$ structure as proved by X-ray
diffraction and M\"o\ss bauer spectroscopy. The magnetic moment of Co$_2$FeSi
was measured to be about $6\mu_B$ at 5K. Magnetic circular dichroism spectra
excited by soft X-rays (XMCD) were taken to determine the element specific
magnetic moment... | 0511463v1 |
2006-06-26 | Epitaxial film growth and magnetic properties of Co_2FeSi | We have grown thin films of the Heusler compound Co_2FeSi by RF magnetron
sputtering. On (100)-oriented MgO substrates we find fully epitaxial
(100)-oriented and L2_1 ordered growth. On Al_2O_3 (11-20) substrates, the film
growth is (110)-oriented, and several in-plane epitaxial domains are observed.
The temperature de... | 0606666v2 |
2006-09-25 | Ion beam induced modification of exchange interaction and spin-orbit coupling in the Co$_2$FeSi Heusler compound | A Co$_2$FeSi (CFS) film with L2$_1$ structure was irradiated with different
fluences of 30 keV Ga$^+$ ions. Structural modifications were subsequently
studied using the longitudinal (LMOKE) and quadratic (QMOKE) magneto-optical
Kerr effect. Both the coercivity and the LMOKE amplitude were found to show a
similar behavi... | 0609633v2 |
2006-09-27 | Huge quadratic magneto-optical Kerr effect and magnetization reversal in the Co$_2$FeSi Heusler compound | Co$_2$FeSi(100) films with L2$_1$ structure deposited onto MgO(100) were
studied exploiting both longitudinal (LMOKE) and quadratic (QMOKE)
magneto-optical Kerr effect. The films exhibit a huge QMOKE signal with a
maximum contribution of up to 30 mdeg, which is the largest QMOKE signal in
reflection that has been measu... | 0609688v2 |
2007-11-06 | Half-metallic ferromagnets: From band structure to many-body effects | A review of new developments in theoretical and experimental electronic
structure investigations of half-metallic ferromagnets (HMF) is presented.
Being semiconductors for one spin projection and metals for another ones, these
substances are promising magnetic materials for applications in spintronics
(i.e., spin-depen... | 0711.0872v1 |
2008-04-17 | Electronic Structures of Fe$_{3-x}V$_x$Si Probed by Photoemission Spectroscopy | The electronic structures of the Heusler type compounds Fe$_{3-x}V$_x$Si in
the concentration range between x = 0 and x = 1 have been probed by
photoemission spectroscopy (PES). The observed shift of Si 2p core- level and
the main valence band structres indicate a chemical potential shift to higher
energy with increasi... | 0804.2712v1 |
2008-09-18 | Improvement of structural, electronic, and magnetic properties of Co$_2$MnSi thin films by He$^+$-irradiation | The influence of 30 keV He$^+$ ion irradiation on structural, electronic and
magnetic properties of Co$_2$MnSi thin films with B2 order was investigated. It
was found, that irradiation with light ions can improve the local chemical
order. This provokes changes of the electronic structure and element-specific
magnetizat... | 0809.3192v1 |
2008-10-05 | Brillouin light scattering study of Co$_{2}$Cr$_{0.6}$Fe$_{0.4}$Al and Co$_{2}$FeAl Heusler compounds | The thermal magnonic spectra of Co$_{2}$Cr$_{0.6}$Fe$_{0.4}$Al (CCFA) and
Co$_2$FeAl were investigated using Brillouin light scattering spectroscopy
(BLS). For CCFA, the exchange constant A (exchange stiffness D) is found to be
0.48 $\mu$erg/cm (203 meV A$^2$), while for Co$_2$FeAl the corresponding values
of 1.55 $\mu... | 0810.0838v2 |
2010-10-27 | Electronic structure of fully epitaxial Co2TiSn thin films | In this article we report on the properties of thin films of the full Heusler
compound Co2TiSn prepared by DC magnetron co-sputtering. Fully epitaxial,
stoichiometric films were obtained by deposition on MgO (001) substrates at
substrate temperatures above 600{\deg}C. The films are well ordered in the L21
structure, an... | 1010.5754v1 |
2010-11-11 | Influence of tetragonal distortion on the magnetic and electronic properties of the Heusler compound Co2TiSn from first principles | Using the full potential linearized augmented plane wave plus local orbitals
method we determine ab-initio the lattice parameters of tetragonally distorted
Co2TiSn in the L21 structure. The tetragonal lattice parameter c is determined
as a function of the lattice parameter a by energy minimization. The change in
total ... | 1011.2657v1 |
2010-12-14 | Scaling behavior of the spin pumping effect in ferromagnet/platinum bilayers | We systematically measured the DC voltage V_ISH induced by spin pumping
together with the inverse spin Hall effect in ferromagnet/platinum bilayer
films. In all our samples, comprising ferromagnetic 3d transition metals,
Heusler compounds, ferrite spinel oxides, and magnetic semiconductors, V_ISH
invariably has the sam... | 1012.3017v2 |
2011-01-06 | Metallic surface electronic state in half-Heusler compounds RPtBi (R = Lu, Dy, Gd) | Rare-earth platinum bismuth (RPtBi) has been recently proposed to be a
potential topological insulator. In this paper we present measurements of the
metallic surface electronic structure in three members of this family, using
angle resolved photoemission spectroscopy (ARPES). Our data shows clear
spin-orbit splitting o... | 1101.1261v1 |
2011-06-19 | Magnetic and transport properties of rare-earth-based half-Heusler phases RPdBi: prospective systems for topological quantum phenomena | RPdBi (R = Er, Ho, Gd, Dy, Y, Nd) compounds were studied by means of x-ray
diffraction, magnetic susceptibility, electrical resistivity,
magnetoresistivity, thermoelectric power and Hall effect measurements,
performed in the temperature range 1.5-300 K and in magnetic fields up to 12 T.
These ternaries, except diamagne... | 1106.3763v1 |
2011-09-05 | Superconductivity in the topological semimetal YPtBi | The noncentrosymmetric Half Heusler compound YPtBi exhibits superconductivity
below a critical temperature T_c = 0.77 K with a zero-temperature upper
critical field H_c2(0) = 1.5 T. Magnetoresistance and Hall measurements support
theoretical predictions that this material is a topologically nontrivial
semimetal having ... | 1109.0979v2 |
2011-09-16 | Magnetic order in GdBiPt studied by x-ray resonant magnetic scattering | Rare earth (R) half-Heusler compounds, RBiPt, exhibit a wide spectrum of
novel ground states. Recently, GdBiPt has been proposed as a potential
antiferromagnetic topological insulator (AFTI). We have employed x-ray resonant
magnetic scattering to elucidate the microscopic details of the magnetic
structure in GdBiPt bel... | 1109.3521v1 |
2011-10-25 | Surface spin polarization of the non-stoichiometric Heusler compound Co2Mn(alpha)Si | Using a combined approach of spin-resolved photoemission spectroscopy, band
structure and photoemission calculations we investigate the influence of bulk
defects and surface states on the spin polarization of Co2Mn(alpha)Si thin
films with bulk L21 order. We find that for Mn-poor alloys the spin
polarization at EF is n... | 1110.5451v2 |
2011-11-04 | Electronic structure and symmetry of valence states of epitaxial NiTiSn and NiZr$_{0.5}$Hf$_{0.5}$Sn thin films by hard x-ray photoelectron spectroscopy | The electronic band structure of thin films and superlattices made of Heusler
compounds with NiTiSn and NiZr$_{0.5}$Hf$_{0.5}$Sn composition was studied by
means of polarization dependent hard x-ray photoelectron spectroscopy. The
linear dichroism allowed to distinguish the symmetry of the valence states of
the differe... | 1111.1031v1 |
2012-07-11 | Optical floating zone growth of high-quality Cu2MnAl single crystals | We report the growth of large single-crystals of Cu2MnAl, a ferromagnetic
Heusler compound suitable for polarizing neutron monochromators, by means of
optical floating zone under ultra-high vacuum compatible conditions. Unlike
Bridgman or Czochralsky grown Cu2MnAl, our floating zone grown single-crystals
show highly re... | 1207.2803v1 |
2012-10-10 | Negative spin polarization of Mn2VGa probed by tunnel magnetoresistance | The ferrimagnetic Heusler compound Mn2VGa is predicted to have a pseudogap in
the majority spin channel, which should lead to a negative tunnel
magnetoresistance. We synthesized epitaxial Mn2VGa thin films on MgO(001)
substrates by dc and rf magnetron co-sputtering, resulting in nearly
stoichiometric films. XRD analysi... | 1210.2966v1 |
2013-02-21 | Large zero-field cooled exchange-bias in bulk Mn2PtGa | We report a large exchange-bias (EB) effect after zero-field cooling the new
tetragonal Heusler compound Mn2PtGa from the paramagnetic state. The
first-principle calculation and the magnetic measurements reveal that Mn2PtGa
orders ferrimagnetically with some ferromagnetic (FM) inclusions. We show that
ferrimagnetic (FI... | 1302.5229v1 |
2013-09-25 | Ab-initio calculation of the effective on-site Coulomb interaction parameters for half-metallic magnets | Correlation effects play an important role in the electronic structure of
half-metallic (HM) magnets. In particular, they give rise to non-quasiparticle
states above (or below) the Fermi energy at finite temperatures that reduce the
spin polarization and, as a consequence, the efficiency of spintronics devices.
Employi... | 1309.6657v1 |
2013-11-26 | Large enhancement in the generation efficiency of pure spin currents in Ge using Heusler-compound Co_2FeSi electrodes | We show nonlocal spin transport in n-Ge based lateral spin-valve devices with
highly ordered Co_2FeSi/n^+-Ge Schottky tunnel contacts. Clear spin-valve
signals and Hanle-effect curves are demonstrated at low temperatures,
indicating generation, manipulation, and detection of pure spin currents in
n-Ge. The obtained spi... | 1311.6601v1 |
2014-03-14 | Investigation on Mn$_{3-δ}$Ga/MgO interface for magnetic tunneling junctions | The Mn$_3$Ga Heusler compound and related alloys are the most promising
materials for the realization of spin-transfer-torque switching in magneto
tunneling junctions. Improved performance can be achieved by high quality
interfaces in these multilayered structured devices. In this context, the
interface between Mn$_{1.... | 1403.3556v4 |
2014-10-02 | Investigation of the temperature-dependence of ferromagnetic resonance and spin waves in Co2FeAl0.5Si0.5 | Co2FeAl0.5Si0.5 (CFAS) is a Heusler compound that is of interest for
spintronics applications, due to its high spin polarization and relatively low
Gilbert damping constant. In this study, the behavior of ferromagnetic
resonance as a function of temperature was investigated in CFAS, yielding a
decreasing trend of dampi... | 1410.0439v1 |
2014-12-23 | 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 |
2015-03-12 | 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 |
2015-06-07 | 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 |
2015-12-18 | 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 |
2016-07-01 | 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 $\... | 1607.00116v1 |
2016-10-21 | Giant Positive Magnetoresistance and field-induced metal insulator transition in Cr2NiGa | We report here the magneto-transport properties of the newly synthesized
Heusler compound Cr2NiGa which crystallizes in a disordered cubic B2 structure
belonging to Pm-3m space group. The sample is found to be paramagnetic down to
2 K with metallic character. On application of magnetic field, a significantly
large incr... | 1610.06771v1 |
2016-11-08 | Geometry of Adaptive Martensite in Ni-Mn-based Heusler alloys | Modulated martensites play an important role in magnetic shape memory alloys,
because all functional properties are closely connected to the twin
microstructure and the phase boundary. The nature of the modulated martensites
is still unclear. One approach is the concept of adaptive martensite, which
regards all modulat... | 1611.02535v2 |
2017-01-06 | Generic coexistence of Fermi arcs and Dirac cones on the surface of time-reversal invariant Weyl semimetals | The hallmark of Weyl semimetals is the existence of open constant-energy
contours on their surface -- the so-called Fermi arcs -- connecting Weyl
points. Here, we show that for time-reversal symmetric realizations of Weyl
semimetals these Fermi arcs in many cases coexist with closed Fermi pockets
originating from surfa... | 1701.01660v3 |
2017-03-15 | Two-channel conduction in YbPtBi | We investigated transport, magnetotransport, and broadband optical properties
of the half-Heusler compound YbPtBi. Hall measurements evidence two types of
charge carriers: highly mobile electrons with a temperature-dependent
concentration and low-mobile holes; their concentration stays almost constant
within the invest... | 1703.05202v1 |
2017-07-23 | Majorana surface modes of nodal topological pairings in spin-$\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 |
2017-09-19 | Effect of Co substitution on Ni$_{2}$MnGe Heusler alloy: ab initio study | Ab initio calculations shown that the Co substitution instead of Ni in
Ni$_{2}$MnGe with the L2$_{1}$ crystallographic structure leads to a decrease
of the lattice constant and an increase of the total magnetic moment of the
Ni$_{2-x}$Co$_{x}$MnGe compounds. The Mn(B) has the largest local moment above
$3~\mu_{B}$ coup... | 1709.06490v1 |
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 |
2017-12-30 | 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 |
2018-01-17 | 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 |
2018-03-09 | 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 |
2018-06-03 | Chiral Magnetic Skyrmions with Arbitrary Topological Charge ("skyrmionic sacks") | We show that continuous and spin-lattice models of chiral ferro- and
antiferromagnets provide the existence of an infinite number of stable soliton
solutions of any integer topological charge. A detailed description of the
morphology of new skyrmions and the corresponding energy dependencies are
provided. The considere... | 1806.00782v2 |
2019-04-04 | First-principles investigations of orthorhombic-cubic phase transition and its effect on thermoelectric properties in cobalt-based ternary alloys | We screened six cobalt-based 18-VEC systems CoVSi, CoNbSi, CoTaSi (Si-group)
and CoVGe, CoNbGe, CoTaGe (Ge-group) by the first-principles approach, with the
motivation of stabilizing these orthorhombic phases into the cubic symmetry --
favorable for thermoelectrics. Remarkably, it was found that the Ge-group is
energet... | 1904.02485v1 |
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 |
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 |
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 |
2018-08-06 | Formation of Spatial Patterns by Spin-selective Excitations of Interacting Fermions | We describe the formation of charge- and spin-density patterns induced by
spin-selective photoexcitations of interacting fermionic systems in the
presence of a microstructure. As an example, we consider a one-dimensional
Hubbard-like system with a periodic magnetic microstructure, which has a
uniform charge distributio... | 1808.02138v3 |
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 |
2020-04-01 | Importance of site occupancy and absence of strain glassy phase in Ni$_{2-x}$Fe$_{x}$Mn$_{1.5}$In$_{0.5}$ | Martensitic transition temperature steadily decreases in
Ni$_{2-x}$Fe$_{x}$Mn$_{1.5}$In$_{0.5}$ and is completely suppressed at $x$ =
0.2. Despite suppression of martensitic transition,
Ni$_{1.8}$Fe$_{0.2}$Mn$_{1.5}$In$_{0.5}$ does not display the expected strain
glassy phase. Instead, a ground state with dominant ferr... | 2004.00256v1 |
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 |
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 |
2019-12-08 | Investigation of Thermoelectric properties of Magnetic Insulator FeRuTiSi Using First Principle Calculation | In this work, we have investigated the electronic structure and
thermoelectric properties of quaternary heusler alloy, FeRuTiSi, using first
principle DFT tools implemented in WIEN2k and BoltzTraP code. Electronic
structure calculations using TB-mBJ potential shows appearance of flat band at
the conduction band edge, t... | 1912.03708v1 |
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 |
2020-03-04 | Theoretical study of phase stability, electronic and magnetic properties of Rh$_2$CrGe$_{1-x}$Al$_x$ ($x = 0$, $0.25$, $0.50$, $0.75$ and $1$) Heusler alloys by FP-LAPW method | First-principle calculations were performed within the framework of the
density functional theory (DFT) using FP-LAPW method as implemented in WIEN2k
code to determine the structural stability, electronic and magnetic properties
of Rh$_2$CrGe$_{1-x}$Al$_x $($x = 0$, $0.25$, $0.50$, $0.75$ and $1$). The
results showed t... | 2003.02067v1 |
2020-03-25 | Crystal and magnetic structure of antiferromagnetic Mn$_{2}$PtPd | We have investigated the crystal and magnetic structure of Mn${}_{2}$PtPd
alloy using powder x-ray and neutron diffraction experiments. This compound is
believed to belong to the Heusler family having crystal symmetry
$\mathit{I}$4/$\mathit{mmm}$ (TiAl${}_{3}$-type). However, in this work we
found that the Pd and Pt at... | 2003.11569v1 |
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 |
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 |
2022-10-10 | Numerical stability and efficiency of response property calculations in density functional theory | Response calculations in density functional theory aim at computing the
change in ground-state density induced by an external perturbation. At finite
temperature these are usually performed by computing variations of orbitals,
which involve the iterative solution of potentially badly-conditioned linear
systems, the Ste... | 2210.04512v2 |
2023-01-24 | Ru$_{2-x}$Mn$_{1+x}$Al thin films | The cubic Heusler alloy Ru$_{2-x}$Mn$_{1+x}$Al is grown in thin film form on
MgO and MgAl$_2$O$_4$ substrates. It is a highly spin-polarised ferrimagnetic
metal, with weak magnetocrystalline anisotropy. Although structurally and
chemically similar to $\text{Mn}_2\text{Ru}_x\text{Ga}$, it does not exhibit
ferrimagnetic ... | 2301.10148v2 |
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 |
2023-05-15 | Magnetic order and electronic transport properties in the Mn$_3$Al compound: the role of the structural state | Electronic transport and magnetic properties of bulk and rapid melt quenched
samples of the Mn$_3$Al Heusler alloy were studied. A correlation between the
magnetic and structural states was established. For a cast sample, there is no
ferromagnetic moment, and the behavior of the magnetic susceptibility (break at
low te... | 2305.08646v1 |
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