Publications (31)
Two-channel conduction in YbPtBi
M. B. Schilling, A. Löhle, D. Neubauer +4
We investigated transport, magnetotransport, and broadband optical properties of the half-Heusler compound YbPtBi. Hall measurements evidence two types of charge carriers: highly m…
Exchange gap in GdPtBi probed by magneto-optics
S. Polatkan, E. Uykur, I. Mohelsky +6
We measured the magneto-reflectivity spectra (4 - 90 meV, 0 - 16 T) of the triple-point semimetal GdPtBi and found them to demonstrate two unusual broad features emerging in field.…
Magnetotransport and thermal properties characterization of 55 K superconductor SmFeAsO0.85F0.15
Amit Srivastava, Anand Pal, Saurabh Singh +4
Correlation between structural/microstructural and magneto-thermal transport properties of FeAs-based SmFeAsO and SmFeAsO0.85F0.15 has been studied in detail. The Rietveld analysis…
Emergent Spin-Singlet Pairing in the Frustrated Kagome Metal ScMnAlSi
R. Guehne, A. K. Sharma, P. Yanda +7
The metallic kagome compound ScMnAlSi has attracted attention as a candidate platform where geometric frustration and itinerant electrons may cooperate to stabilize…
Pressure-dependent Electronic Superlattice in the Kagome-Superconductor CsVSb
F. Stier, A. -A. Haghighirad, G. Garbarino +9
We present a high-resolution single crystal x-ray diffraction study of kagome-superconductor \cvs, exploring its response to variations in pressure and temperature. We discover tha…
Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe
D. Subires, A. Kar, A. Korshunov +18
The intrinsic frustrated nature of a kagome lattice is amenable to the realization of exotic phases of matter, such as quantum spin liquids or spin ices, and more recently the mult…
Interlayer charge transfer induced by electronic instabilities in the natural van der Waals hetrostructure 4H-TaS
R. Mathew Roy, X. Feng, M. Wenzel +6
The natural van der Waals heterostructure 4H-TaS composed of alternating 1T- and 1H-TaS layers serves as a platform for investigating the electronic correlations and la…
Unravelling disorder in kagome YbCoGe
A. Korshunov, C. A. Fuller, C. -Y. Lim +7
The presence of phonon instabilities that leads to the formation of charge modulated states in kagome metals has allowed their classification based on the atomic displacements. Her…
Optical conductivity of the Weyl semimetal NbP
D. Neubauer, A. Yaresko, Weiwu Li +7
The optical properties of (001)-oriented NbP single crystals have been studied in a wide spectral range from 6 meV to 3 eV from room temperature down to 10 K. The itinerant carrier…
Linear-in-frequency optical conductivity in GdPtBi due to transitions near the triple points
F. Hütt, A. Yaresko, M. B. Schilling +4
The complex optical conductivity of the half-Heusler compound GdPtBi is measured in a frequency range from 20 to 22 000 cm (2.5 meV - 2.73 eV) at temperatures down to 10 K i…
Thermopower and thermal conductivity in the Weyl semimetal NbP
U. Stockert, R. D. dos Reis, M. O. Ajeesh +7
The Weyl semimetal NbP exhibits an extremely large magnetoresistance (MR) and an ultra-high mobility. The large MR originates from a combination of the nearly perfect compensation…
Pressure tuning the Fermi-surface topology of the Weyl semimetal NbP
R. D. dos Reis, S. C. Wu, Y. Sun +6
We report on the pressure evolution of the Fermi surface topology of the Weyl semimetal NbP, probed by Shubnikov-de Haas oscillations in the magnetoresistance combined with ab-init…
Observation of the Critical State to Multiple-Type Dirac Semimetal Phases in KMgBi
D. F. Liu, L. Y. W, C. C. Le +21
Dirac semimetals (DSMs) are classified into different phases based on the types of the Dirac fermions. Tuning the transition among different types of the Dirac fermions in one syst…
Observation of pressure-induced Weyl state and superconductivity in a chirality-neutral Weyl semimetal candidate SrSi2
M. -Y. Yao, J. Noky, Q. -G. Mu +7
Quasi-particle excitations in solids described by the Weyl equation have attracted significant attention in recent years. Thus far, a wide range of solids that have been experiment…
Pressure-induced Lifshitz transition in NbP: Raman, x-ray diffraction, electrical transport and density functional theory
Satyendra Nath Gupta, Anjali Singh, Koushik Pal +8
We report high pressure Raman, synchrotron x-ray diffraction and electrical transport studies on Weyl semimetals NbP and TaP along with first-principles density functional theoreti…
Giant enhancement of the skyrmion stability in a chemically strained helimagnet
A. S. Sukhanov, Praveen Vir, A. Heinemann +6
We employed small-angle neutron scattering to demonstrate that the magnetic skyrmion lattice can be realized in bulk chiral magnets as a thermodynamically stable state at temperatu…
Symmetry-Selective Stabilization of Charge-Density Wave in ScVSn
A. Korshunov, C. -Y. Lim, J. Corral-Sertal +10
Charge-density-wave (CDW) order in kagome metals is highly sensitive to external tuning parameters such as chemical substitution and hydrostatic pressure, which generally suppress…
Magneto-optical response of the Weyl semimetal NbAs: Experimental results and hyperbolic-band computations
S. Polatkan, E. Uykur, J. Wyzula +5
The magneto-optical properties of (001)-oriented NbAs single crystals have been studied in the spectral range from 5 to 150 meV and in magnetic fields of up to 13 T. A rich spectru…
Cascade of pressure induced competing CDWs in the kagome metal FeGe
A. Korshunov, A. Kar, C. -Y. Lim +14
Electronic ordering is prevalent in correlated systems, which commonly exhibit competing interactions. Here, we use x-ray diffraction to demonstrate a cascade of pressure induced o…
Magnon spectrum of the Weyl semimetal half-Heusler compound GdPtBi
A. S. Sukhanov, Y. A. Onykiienko, R. Bewley +3
The compound GdPtBi is known as a material where the non-trivial topology of electronic bands interplays with an antiferromagnetic order, which leads to the emergence of many inter…
Large zero-field cooled exchange-bias in bulk Mn2PtGa
A. K. Nayak, M. Nicklas, S. Chadov +4
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 th…
Temperature-driven reorganization of electronic order in CsVSb
Q. Stahl, D. Chen, T. Ritschel +3
We report a temperature dependent x-ray diffraction study of the electronic ordering instabilities in the kagome material CsVSb. Our measurements between 10 K and 120 K rev…
On the search for the chiral anomaly in Weyl semimetals: The negative longitudinal magnetoresistance
R. D. dos Reis, M. O. Ajeesh, N. Kumar +6
Recently, the existence of massless chiral (Weyl) fermions has been postulated in a class of semi-metals with a non-trivial energy dispersion.These materials are now commonly dubbe…
Electrical and Thermal Transport at the Planckian Bound of Dissipation in the Hydrodynamic Electron Fluid of WP2
J. Gooth, F. Menges, C. Shekhar +7
Materials with strongly-correlated electrons exhibit interesting phenomena such as metal-insulator transitions and high-temperature superconductivity. In stark contrast to ordinary…
Large ground state magnetic moment and magnetocaloric effect in Ni2Mn1.4In0.6
Sanjay Singh, Luana Caron, S. W. DSouza +6
A large conventional magnetocaloric effect at the second order magnetic transition in cubic Ni2Mn1.4In0.6 Heusler alloy is reported. The isothermal magnetization at 2K shows a huge…
Field induced charge symmetry in topological insulator BiTe revealed by nuclear magnetic resonance
R. Guehne, J. Haase, C. Shekhar +1
Nuclear magnetic resonance (NMR) was recently shown to measure the bulk band inversion of BiSe through changes in the Bi nuclear quadrupole interaction, and the cor…
Softening of a flat phonon mode in the kagome ScVSn
A. Korshunov, H. Hu, D. Subires +16
The long range electronic modulations recently discovered in the geometrically frustrated kagome lattice have opened new avenues to explore the effect of correlations in materials…
Intriguing Low-Temperature Phase in the Antiferromagnetic Kagome Metal FeGe
M. Wenzel, E. Uykur, A. A. Tsirlin +7
The properties of kagome metals are governed by the interdependence of band topology and electronic correlations resulting in remarkably rich phase diagrams. Here, we study the tem…
Magneto-optics of a Weyl semimetal beyond the conical band approximation: the case study of TaP
S. Polatkan, M. O. Goerbig, J. Wyzula +10
Landau-level spectroscopy, the optical analysis of electrons in materials subject to a strong magnetic field, is a versatile probe of the electronic band structure and has been suc…
Revealing magnetism in the distorted kagome TiBi ( = Nd, Sm, Gd) via ARPES and XMCD
C. Lim, F. Ballester, A. Kar +19
Kagome materials are known for hosting emergent quantum phenomena driven by the interaction between different lattice, charge and spin orders. Here, we present a detailed angle res…
Structural and magnetic phases of topological kagome metal FeSn under pressure
S. Chattopadhyay, L. Thomarat, C. S. Ong +8
We investigate the pressure-induced evolution of crystal structure and magnetism in the kagome ferromagnet FeSn by combining X-ray diffraction, X-ray Emission Spectroscopy,…