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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.92: Poster

Wednesday, March 14, 2018, 15:00–19:00, Poster B

EPR studies of the triangular-lattice antiferromagnet Cs₂CuBr₄ — •Erik Schulze^1,2, Alexey N. Ponomaryov¹, Jochen Wosnitza^1,2, Hidekazu Tanaka³, and Sergei A. Zvyagin¹ — ¹Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ²Institut für Festkörper- und Materialphysik, TU Dresden, Dresden, Germany — ³Tokyo Institute of Technology, Tokyo, Japan

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/k_B), 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.

This work was partially supported by Deutsche Forschungsgemeinschaft (project ZV 6/2-2) and by the HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL).