Abstract
We report on electron spin resonance (ESR) studies of the spin relaxation in CsCuCl. The main source of the ESR linewidth at temperatures K is attributed to the uniform Dzyaloshinskii-Moriya interaction. The vector components of the Dzyaloshinskii-Moriya interaction are determined from the angular dependence of the ESR spectra using a high-temperature approximation. Both the angular and temperature dependencies of the ESR linewidth have been analyzed using a self-consistent quantum-mechanical approach. In addition, analytical expressions based on a quasiclassical picture for spin fluctuations are derived, which show good agreement with the quantum-approach for temperatures K. A small modulation of the ESR linewidth observed in the plane is attributed to the anisotropic Zeeman interaction, which reflects the two magnetically nonequivalent Cu positions.
- Received 3 August 2012
DOI:https://doi.org/10.1103/PhysRevB.88.174421
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