Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Correlated Electrons: Low-dimensional Systems - Materials 3
TT 40.12: Vortrag
Donnerstag, 29. März 2012, 18:00–18:15, H 0104
ESR studies of the quasi-2D frustrated Cs2CuBr4 — •S.A. Zvyagin1, D. Kamensky1, J. Wosnitza1, M. Ikeda2, T. Fujita2, M. Hagiwara2, O.A. Starykh3, R. Hu4,5, H. Ryu4, and C. Petrovic4 — 1Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), 01328 Dresden, Germany — 2KYOKUGEN, Osaka University, Toyonaka, Osaka 560-8531, Japan — 3Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA — 4Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA — 5University of Maryland, Center for Nanophysics and Advanced Materials, College Pk, MD 20742 USA
We report low-temperature electron spin resonance (ESR) studies of single-crystalline samples of Cs2CuBr4, a spin-1/2 antiferromagnet with a triangular spin-lattice structure. A remarkable angular dependence of the resonance field, including the splitting of the ESR line for some orientations of the magnetic field, and the presence of a gap in the ESR excitation spectrum at temperatures above the Neel temperature, TN = 1.3 K, have been revealed. Our observations suggest that uniform Dzyaloshinskii-Moriya interaction affects the low-energy excitation spectrum in this frustrated compound. The results are compared with that obtained recently for the isostructural material Cs2CuCl4 [1].
The work was supported in part by DFG and EuroMagNET II (EU Contract No. 228043).
Povarov et al., Phys. Rev. Lett. 107, 037204 (2011)