Publications (19)
Anisotropic electrical resistivity of LaFeAsO: evidence for electronic nematicity
A. Jesche, F. Nitsche, S. Probst +3
Single crystals of LaFeAsO were successfully grown out of KI flux. Temperature dependent electrical resistivity was measured with current flow along the basal plane, Ï_perpend(T),…
Spin-wave dynamics in the KCeS2 delafossite: A theoretical description of powder inelastic neutron-scattering data
S. M. Avdoshenko, A. A. Kulbakov, E. HäuÃler +4
Layered rare-earth delafossites with = Yb(III) or Ce(III) have received a lot of interest as potential hosts for a quantum spin-liquid ground state. Some systems of thi…
Electrical resistivity and tunneling anomalies in CeCuAs2
E. V. Sampathkumaran, T. Ekino, R. A. Ribeiro +9
The compound CeCuAs2 is found to exhibit negative temperature (T) coefficient of electrical resistivity (rho) under ambient pressure conditions in the entire T-range of investigati…
Magnetic and transport anomalies in the compounds, RCuAs2 (R= Pr, Nd, Sm, Gd, Tb, Dy, Ho, and Er)
Kausik Sengupta, S. Rayaprol, E. V. Sampathkumaran +2
The results of dc magnetization, heat capacity, electrical resistivity (rho) and magnetoresistance measurements are reported in detail for the compounds, RCuAs2 for R= Pr, Nd, Sm,…
Magnetic behavior of EuCu2As2: Delicate balance between antiferromagnetic and ferromagnetic order
Kausik Sengupta, P. L. Paulose, E. V. Sampathkumaran +2
The Eu-based compound, EuCu2As2, crystallizing in the ThCr2Si2-type tetragonal structure, has been synthesized and its magnetic behavior has been investigated by magnetization (M),…
Magnetic Properties of an Effective Spin- Triangular-Lattice Compound LiYbS
K. M. Ranjith, Ph. Schlender, Th. Doert +1
Here, we report the synthesis and magnetic properties of a Yb-based triangular-lattice compound LiYbS. At low temperatures, it features an effective spin- state du…
Anisotropic magnetism and spin fluctuations in the triangular-lattice spin-liquid candidate NaYbSe: a single-crystal Na and Se NMR study
S. Luther, K. M. Ranjith, Th. Doert +3
The ytterbium-based delafossite NaYbSe is discussed as a prototype for a spin-orbit entangled, effective spin-1/2 triangular spin lattice with emerging antiferromagnetic correl…
Structural trends from a consistent set of single-crystal data of REFeAsO (RE = La, Ce, Pr, Nd, Sm, Gd, and Tb)
F. Nitsche, A. Jesche, E. Hieckmann +2
A new crystal growth technique for single-crystals of REFeAsO (RE = La, Ce, Pr, Nd, Sm, Gd, and Tb) using NaI/KI as flux is presented. Crystals with a size up to 300 m were iso…
Magnetic and electrical transport anomalies in RMAs2 (R= Pr and Sm, M= Ag and Au)
K. Mukherjee, E. V. Sampathkumaran, D. Rutzinger +2
The results of magnetization, heat-capacity, and electrical resistivity (rho) studies of the compounds, RMAs2 (R= Pr and Sm; M= Ag, Au), crystallizing in HfCuSi2-derived structure…
Anisotropic field-induced ordering in the triangular-lattice quantum spin liquid NaYbSe
K. M. Ranjith, S. Luther, T. Reimann +10
High-quality single crystals of NaYbSe, which resembles a perfect triangular-lattice antiferromagnet without the intrinsic disorder, are investigated by magnetization and speci…
Enhanced electrical resistivity before Néel order in the metals, RCuAs (R= Sm, Gd, Tb and Dy
E. V. Sampathkumaran, Kausik Sengupta, S. Rayaprol +3
We report an unusual temperature (T) dependent electrical resistivity() behavior in a class of ternary intermetallic compounds of the type RCuAs (R= Rare-earths). For some…
Dilution of the magnetic lattice in the Kitaev candidate -RuCl by Rh doping
G. Bastien, E. Vinokurova, M. Lange +8
Magnetic dilution of a well-established Kitaev candidate system is realized in the substitutional RuRhCl series (). Optimized syntheses protocols yiel…
J description of the honeycomb Mott insulator -RuCl
A. Koitzsch, C. Habenicht, E. Mueller +7
Novel ground states might be realized in honeycomb lattices with strong spin-orbit coupling. Here we study the electronic structure of -RuCl, in which the Ru ions are in a…
Quantum spin liquid ground state in the disorder free triangular lattice NaYbS
R. Sarkar, Ph. Schlender, V. Grinenko +4
Rare-earth delafossites were recently proposed as promising candidates for the realization of an effective =1/2 quantum spin liquid (QSL) on the triangular lattice. In contrast…
Nearest-neighbor Kitaev exchange blocked by charge order in electron doped -RuCl
A. Koitzsch, C. Habenicht, E. Mueller +9
A quantum spin-liquid might be realized in -RuCl, a honeycomb-lattice magnetic material with substantial spin-orbit coupling. Moreover, -RuCl is a Mott insulato…
Yb delafossites: unique exchange frustration of 4f spin 1/2 moments on a perfect triangular lattice
B. Schmidt, J. Sichelschmidt, K. M. Ranjith +2
While the Heisenberg model for magnetic Mott insulators on planar lattice structures is comparatively well understood in the case of transition metal ions, the intrinsic spin-orbit…
NaYbS - a new planar spin- triangular-lattice magnet and putative spin liquid
M. Baenitz, Ph. Schlender, J. Sichelschmidt +12
Platelike high-quality NaYbS rhombohedral single crystals with lateral dimensions of a few mm have been grown and investigated in great detail by bulk methods like magnetizat…
Magnetic, electrical resistivity, heat-capacity and thermopower anomalies in CeCuAs2
Kausik Sengupta, E. V. Sampathkumaran, T. Nakano +9
The results of magnetic susceptibility, electrical resistivity (), heat-capacity (C) and thermopower (S) measurements on CeCuAs2, forming in ZrCuSi2-type tetragonal structure,…
Tetragonal to Orthorhombic Transition of GdFeAsO Studied by Single-Crystal Synchrotron X-Ray Diffraction
F. Nitsche, Th. Doert, M. Ruck
A study of the tetragonal to orthorhombic phase transition of GdFeAsO is presented. Planes of the reciprocal space were reconstructed form single-crystal synchrotron X-ray diffract…