Spin correlations and Dzyaloshinskii-Moriya interaction in Cs${}_2$CuCl${}_4$

Abstract

We report on electron spin resonance (ESR) studies of the spin relaxation in Cs${}_2$CuCl${}_4$. The main source of the ESR linewidth at temperatures $T\le 150$ 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 dependence of the ESR linewidth have been analyzed using a self-consistent quantum-mechanical approach. In addition analytical expressions based on a quasi-classical picture for spin fluctuations are derived, which show good agreement with the quantum-approach for temperatures $T\ge 2J/k_{\mathrm{B}}\approx 15$ K. A small modulation of the ESR linewidth observed in the $ac$-plane is attributed to the anisotropic Zeeman interaction, which reflects the two magnetically nonequivalent Cu positions.

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• Lattice distortion effects on the frustrated spin-1 triangular-antiferromagnet A3NiNb2O9 (A = Ba, Sr and Ca)
• High precision measurement of the Dzyaloshinsky-Moriya interaction between two rare-earth ions in a solid
• ESR study of the spin ladder with uniform Dzyaloshinskii-Moria interaction
• Specific Heat Study of 1D and 2D Excitations in the Layered Frustrated Quantum Antiferromagnets Cs${}_2$CuCl${}_{4-x}$Br${}_x$
• High-field magnetic resonance of spinons and magnons in a triangular lattice S=1/2 antiferromagnet Cs2CuCl4
• Spin gap in a quasi-1D S=1/2 antiferromagnet K2CuSO4Cl2
• Magnon-Magnon Interactions in O(3) Ferromagnets and Equations of Motion for Spin Operators
• Spin relaxation in Cs${}_2$CuCl${}_{4-x}$Br${}_x$
• Electron spin resonance study of spin relaxation in the strong-leg spin ladder with nonmagnetic dilution
• Quasi-one-dimensional Spin Dynamics in a Molecular Spin Liquid System
• Magnetic resonance of collective paramagnets with gapped excitations spectrum
• Gapped magnetic ground state in the spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Ag${}_2$(CN)${}_3$ suggested by magnetic spectroscopy