EPR studies of the triangular-lattice antiferromagnet Cs₂CuBr₄

EPR studies of the triangular-lattice antiferromagnet Cs₂CuBr₄

Schulze, E. ; Ponomaryov, A.N. ; Wosnitza, J. ; Tanaka, H. ; Zvyagin, S.A.

Тема: Специальный выпуск. К 80-летию со дня рождения А.И. Звягина

Інший ID: PACS: 75.50.Ee, 76.30.–v, 76.50.+g

URI: http://dspace.nbuv.gov.ua/handle/123456789/175327

Посилання: EPR studies of the triangular-lattice antiferromagnet Cs₂CuBr₄ / E. Schulze, A.N. Ponomaryov, J. Wosnitza, H. Tanaka, S.A. Zvyagin // Физика низких температур. — 2017. — Т. 43, № 11. — С. 1642-164. — Бібліогр.: 27 назв. — англ.

Підтримка: This work was supported by the Deutsche Forschungs-gemeinschaft (DFG, Germany) and by the HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL). The authors would like to thank M. S. Henriques for the help orienting samples.

Дата: 2017

Завантажень: 361

EPR studies of the triangular-lattice antiferromagnet Cs₂CuBr₄

Анотація:

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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