A5080937279- Rare-earth and actinide compounds
- Inorganic Chemistry and Materials
- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Crystal Structures and Properties
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Magnetic Properties of Alloys
- Boron and Carbon Nanomaterials Research
- Topological Materials and Phenomena
- Magnetic properties of thin films
- Heusler alloys: electronic and magnetic properties
- Advanced Thermoelectric Materials and Devices
- X-ray Diffraction in Crystallography
- MXene and MAX Phase Materials
- Superconductivity in MgB2 and Alloys
- Semiconductor materials and interfaces
- Multiferroics and related materials
- Crystallization and Solubility Studies
- Chemical Synthesis and Characterization
- Thermal Expansion and Ionic Conductivity
- High-pressure geophysics and materials
- Magnetism in coordination complexes
- Solid-state spectroscopy and crystallography
- Intermetallics and Advanced Alloy Properties
Max Planck Institute for Chemical Physics of Solids
2016-2025
Max Planck Society
2014-2024
Max Planck Institute for Solid State Research
1995-2024
Ludwig-Maximilians-Universität München
2019
LMU Klinikum
2019
University of Freiburg
2019
University of Regensburg
2019
University of California, Davis
2019
Multidisciplinary Digital Publishing Institute (Switzerland)
2019
Technische Universität Dresden
2000-2015
Abstract Transition metal dichalcogenides have attracted research interest over the last few decades due to their interesting structural chemistry, unusual electronic properties, rich intercalation chemistry and wide spectrum of potential applications. Despite fact that majority related focuses on semiconducting transition-metal (for example, MoS 2 ), recently discovered unexpected properties WTe are provoking strong in semimetallic transition featuring large magnetoresistance,...
It is well established that the anomalous Hall effect a ferromagnet displays scales with its magnetization. Therefore, an antiferromagnet has no net magnetization should exhibit effect. Here we show non-collinear triangular Mn3Ge exhibits large comparable to of ferromagnetic metals; magnitude conductivity 500 per ohm cm at 2 K and 50 room temperature. The angular dependence measurements confirm small residual in-plane magnetic moment role in observed Our theoretical calculations demonstrate...
Weyl and Dirac fermions have created much attention in condensed matter physics materials science. Recently, several additional distinct types of been predicted. Here, we report ultra-high electrical conductivity MoP at low temperature, which has recently established as a triple point Fermion material. Here show that the resistivity is 6 n-ohm cm 2 K with large mean free path 11 microns. de Haas-van Alphen oscillations reveal spin splitting Fermi surfaces. In contrast to noble metals similar...
Applying a temperature gradient in magnetic material generates voltage that is perpendicular to both the heat flow and magnetization. This anomalous Nernst effect (ANE) which was thought be proportional value of magnetization for long time. However, more generally, ANE has been predicted originate from net Berry curvature all bands near Fermi level. Subsequently, large thermopower recently observed topological materials with no but around E$_F$. These experiments clearly fall outside scope...
The discovery of magnetic topological semimetals has recently attracted significant attention in the field topology and thermoelectrics. In a thermoelectric device based on Nernst geometry, an external magnet is required as integral part. Reported zero-field effect newly discovered hard-ferromagnetic kagome-lattice Weyl-semimetal Co3 Sn2 S2 . A maximum thermopower ≈3 µV K-1 at 80 K zero achieved this Weyl-semimetal. results demonstrate possibility application hard for low-power devices are...
Single crystals of novel orthorhombic (space group Pnnm) iron tetraboride ${\mathrm{FeB}}_{4}$ were synthesized at pressures above 8 GPa and high temperatures. Magnetic susceptibility heat capacity measurements demonstrate bulk superconductivity below 2.9 K. The putative isotope effect on the superconducting critical temperature analysis specific data indicate that in is likely phonon mediated, which rare for Fe-based superconductors. discovered highly incompressible has nanoindentation...
Topological materials ranging from topological insulators to Weyl and Dirac semimetals form one of the most exciting current fields in condensed-matter research. Many half-Heusler compounds, RPtBi (R = rare earth), have been theoretically predicted be semimetals. Among various attributes envisaged RPtBi, surface states, chiral anomaly, planar Hall effect observed experimentally. Here, we report an unusual intrinsic anomalous (AHE) antiferromagnetic Heusler semimetal compounds GdPtBi NdPtBi...
In the strontium iron-cobalt arsenides SrFe2-xCoxAs2 (0.2 < or = x 0.4) superconductivity with T_{c} up to 20 K is observed in magnetic susceptibility, electrical resistivity, and specific heat data. This first observation of bulk induced by electron doping this family compounds-despite strong disorder Fe-As layer-favors an itinerant electronic theory contrast strongly correlated cuprates renders a p- d-wave pairing unlikely. The ordering present SrFe2As2 rapidly suppressed substitution Fe...
Single crystals of Ba(8)Au(5.3)Ge(40.7) [space group Pm(3)n (No. 223), a = 10.79891(8) Å] were prepared by Bridgman technique. The crystal structure refinement based on single-crystal X-ray diffraction data does not reveal any vacancies in the Au/Ge framework or cages. In addition to ionic bonding between Ba and anionic framework, direct interaction Au atoms was identified applying electron localizability indicator. As expected chemical-bonding picture, is diamagnet shows p-type electrical...
The electronic structure and physical properties of the pnictide compound families REOFeAs (RE=La, Ce, Pr, Nd, Sm), AFe2As2 (A=Ca, Sr, Ba, Eu), LiFeAs FeSe are quite similar. Here, we focus on members family whose sample composition, quality single-crystal growth more controllable compared with other systems. Using first-principles band calculations, understanding relationship between crystal structure, charge doping magnetism in We will elaborate tetragonal to orthorhombic structural...
Single crystalline Sn${}_{2}$Co${}_{3}$S${}_{2}$ with the shandite-type structure was investigated by magnetization, magnetoresistance, Hall effect, and heat capacity measurements ${}^{119}$Sn M\"o\ss{}bauer spectroscopy. orders ferromagnetically at 172 K an easy-axis magnetization of $\ensuremath{\approx}$1 ${\ensuremath{\mu}}_{B}$ along hexagonal $c$ axis. The half-metallic ferromagnetic state is detailed band-structure calculations density functional theory (DFT) methods....
Noncollinear magnets provide essential ingredients for the next generation memory technology. It is a new prospect Heusler materials, already well known due to diverse range of other fundamental characteristics. Here, we present combined experimental and theoretical study novel noncollinear tetragonal ${\mathrm{Mn}}_{2}\mathrm{RhSn}$ material exhibiting unusually strong canting its magnetic sublattices. undergoes spin-reorientation transition, induced by temperature change suppressed an...
MNiSn (M = Ti, Zr, and Hf) half-Heusler (HH) compounds are widely studied n-type thermoelectric (TE) materials for power generation. Most studies focus on Zr- Hf-based due to their high performance. However, these kinds of compositions not cost-effective. Herein, the least expensive alloy in this family—TiNiSn—is investigated. Modulation doping half-metallic MnNiSb TiNiSn system is realized by using spark plasma sintering. It found that dissolves into matrix forms a heavily doped...
Topological magnetic semimetals promise large Berry curvature through the distribution of topological Weyl nodes or nodal lines and further novel physics with exotic transport phenomena. We present a systematic study structural magnetotransport properties ${\mathrm{Co}}_{2}\mathrm{MnGa}$ films from thin (20 nm) to bulklike behavior (80 in order understand underlying mechanisms role topology. The magnetron sputtered are $L{2}_{1}$-ordered showing very good heteroepitaxy strain-induced...
Kagome magnets are believed to have numerous exotic physical properties due the possible interplay between lattice geometry, electron correlation and band topology. Here, we report large anomalous Hall effect in kagome ferromagnet LiMn$_6$Sn$_6$, which has a Curie temperature of 382 K easy plane along with lattice. At low temperatures, unsaturated positive magnetoresistance opposite signs ordinary coefficient for $\rho_{xz}$ $\rho_{yx}$ indicate coexistence electrons holes system. A...
Topological semimetals are well known for their interesting physical properties, while mechanical properties have rarely received attention. With the increasing demand flexible electronics, we explore great potential of van der Waals bonded Weyl semimetal WTe2 thermoelectric applications. We find that single crystals an ultrahigh Nernst power factor ~3 Wm-1K-2, which outperforms conventional Seebeck factors state-of-the-art semiconductors by 2-3 orders magnitude. A unique band structure...
The kagome metal compounds $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ ($A=\text{K}$, Rb, and Cs) feature a wealth of phenomena including nontrivial band topology, charge density wave (CDW), superconductivity. One intriguing property is the time-reversal symmetry breaking in CDW state without local moments, which leads to anomalous transport responses. Here, we report investigation magnetothermoelectric effects on high-quality ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ single crystals. A large Nernst...
New germanium-platinum compounds with the filled-skutterudite crystal structure were synthesized. The and composition investigated by x-ray diffraction microprobe analysis. Magnetic susceptibility, specific heat, electrical resistivity measurements evidence superconductivity in ${\mathrm{LaPt}}_{4}{\mathrm{Ge}}_{12}$ ${\mathrm{PrPt}}_{4}{\mathrm{Ge}}_{12}$ below 8.3 K. parameters of normal superconducting states established. Strong coupling a electric field singlet ground state is found for...
Zero and longitudinal field muon spin rotation (muSR) experiments were performed on the superconductors PrPt4Ge12 LaPt4Ge12. In below Tc a spontaneous magnetization with temperature variation resembling that of superfluid density appears. This observation implies time-reversal symmetry (TRS) breaking in = 7.9 K. remarkably high for an anomalous superconductor weak gradual change related specific heat anomaly upon La substitution La_(1-x)Pr_xPt_4Ge_(12) suggests TRS is due to orbital degrees...
Phases of the Mn2O3: Two new phases Mn2O3—corundum-type ε-Mn2O3 and perovskite-type ζ-Mn2O3—were obtained by high-pressure high-temperature synthesis. Manganese atoms were found to completely occupy A- B-positions perovskite simultaneously. The ζ-Mn2O3 has an A-site-ordered structure (see picture) containing Mn in three different oxidation states (+II, +III, +IV). As a service our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed...
The synthesis and single crystal growth of clathrate-II Na(24)Si(136) is performed in one step applying the spark plasma treatment to precursor Na(4)Si(4). reported results demonstrate a new route intermetallic compounds facilitated by electric field current. SPS revealed offer significant opportunities as novel preparatory method for solid state materials.
The family of transition-metal dichalcogenides provides a rich platform for studying the interplay between crystal structure and electronic properties in strongly correlated electron systems. Applying external pressure as tuning parameter, authors observed striking correlation critical temperature ${T}_{c}$ superconductivity strength Se-Se bonds high-pressure pyrite phase PdSe${}_{2}$. bond length Se${}_{2}$ dimer was identified main parameter controlling structure. Strong pressure-induced...