Dresden 2020 – wissenschaftliches Programm
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TT 24.7: Vortrag
Dienstag, 17. März 2020, 11:00–11:15, HSZ 304
Evidence of one-dimensional magnetic heat transport in the triangular-lattice antiferromagnet Cs2CuCl4 — E. Schulze1,2, S. Arsenijevic1, L. Opherden1, A.N. Ponomaryov1, J. Wosnitza1,2, T. Ono3, H. Tanaka4, and •S.A. Zvyagin1 — 1Dresden High Magnetic Field Laboratory (HLD-EMFL), HZDR, 01328 Dresden, Germany — 2TU Dresden, 01062 Dresden, Germany — 3Osaka Prefecture University, Osaka 599-8531, Japan — 4Tokyo Institute of Technology, Tokyo 152-8551, Japan
We report on low-temperature heat-transport properties of the spin-1/2 triangular-lattice antiferromagnet Cs2CuCl4. Broad maxima in the thermal conductivity along the three principal axes, observed at about 5 K, are interpreted in terms of the Debye model, including the phonon Umklapp scattering. For thermal transport along the b axis, we found a pronounced field-dependent anomaly, close to the transition into the three-dimensional long-range-ordered state. No such anomalies were observed for the transport along the a and c directions. We argue that this anisotropic behavior is related to an additional heat-transport channel through magnetic excitations, that can best propagate along the direction of the largest exchange interaction. Our observations strongly support the quasi-1D spin-liquid scenario with spinons as elementary excitations, proposed for this frustrated antiferromagnet. Besides, peculiarities of the heat transport of Cs2CuCl4in magnetic fields up to the saturation field and above are discussed .
This work was supported by the DFG.
 E. Schulze et al., Phys. Rev. Research 1, 032022(R) (2019).