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Schulze E. EPR studies of the triangular-lattice antiferromagnet Cs2CuBr4 [Електронний ресурс] / E. Schulze, A. N. Ponomaryov, J. Wosnitza, H. Tanaka, S. A. Zvyagin // Физика низких температур. - 2017. - Т. 43, № 11. - С. 1642-1646. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2017_43_11_14 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.
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