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Journal Articles New Journal of Physics Year : 2015

Magnetic excitations in the spin-1/2 triangular-lattice antiferromagnet Cs2CuBr4

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Abstract

We report on high-field electron spin resonance (ESR) studies of magnetic excitations in the spin-1/2 triangular-lattice antiferromagnet Cs2CuBr4. Frequency-field diagrams of ESR excitations are measured for different orientations of magnetic fields up to 25 T. We show that the substantial zero-field energy gap, Delta approximate to 9.5 K, observed in the low-temperature excitation spectrum of Cs2CuBr4, (Zvyagin et al. 2014 Phys. Rev. Lett. 112 077206) is present well above TN. Noticeably, the transition into the long-range magnetically ordered phase does not significantly affect the size of the gap, suggesting that even below TN the high-energy spin dynamics in Cs2CuBr4 is determined by short-range-order spin correlations. The experimental data are compared with results of model spin-wave-theory calculations for spin-1/2 triangular-lattice antiferromagnet.

Dates and versions

cea-01253063 , version 1 (08-01-2016)

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Cite

S A Zvyagin, M Ozerov, D Kamenskyi, J Wosnitza, J Krzystek, et al.. Magnetic excitations in the spin-1/2 triangular-lattice antiferromagnet Cs2CuBr4. New Journal of Physics, 2015, 17 (11), pp.113059. ⟨10.1088/1367-2630/17/11/113059⟩. ⟨cea-01253063⟩
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