Fizika Nizkikh Temperatur: Volume 43, Number 11 (November 2017), p. 1642-1647    ( to contents , go back )

EPR studies of the triangular-lattice antiferromagnet Cs2CuBr4

E. Schulze1,2, A.N. Ponomaryov1, J. Wosnitza1,2, H. Tanaka3, and S.A. Zvyagin1

1Dresden High Magnetic Field Laboratory (HLD-EMFL) Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany

2Institut für Festkörperphysik, TU Dresden, D-01069 Dresden, Germany
3Tokyo Institute of Technology, Tokyo 152-8550, Japan

Received June 19, 2017


The spin dynamics of the spin-1/2 triangular-lattice antiferromagnet Cs2CuBr4 is probed by means of high-frequency electron paramagnetic resonance (EPR) spectroscopy. Temperature dependences of EPR parameters are studied in a broad temperature range between 1.4 and 200 K for different orientations of the applied magnetic field. In the high-temperature regime (T >> J/kB), an unusually broad and anisotropic resonance line is detected, suggesting a sizeable Dzyaloshinskii–Moriya interaction. Employing the theory of exchange narrowing, the ratio of the Dzyaloshinskii–Moriya vector components, Dc/Da ≈ 0.3, is estimated.

PACS: 75.50.Ee Antiferromagnetics;
PACS: 76.30.–v Electron paramagnetic resonance and relaxation;
PACS: 76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance.

Key words: antiferromagnet, EPR, Dzyaloshinskii–Moriya interaction.

Published online: September 25, 2017

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ISSN: 0132-6414 (Print) | ISSN: 1816-0328 (Online)