Spin dynamics of the quasi two dimensional spin-1/2 quantum magnet Cs_2CuCl_4

Details Spin dynamics of the quasi two dimensional spin-1/2 quantum magnet Cs_2CuCl_4 Spin dynamics of the quasi two dimensional spin-1/2 quantum magnet Cs_2CuCl_4

2005-06-24

arxiv.org/abs/cond-mat/0506667v1

Phys. Rev. B 72, 134429 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 11 figures, higher quality figures can be obtained from the authors

Scientific paper

10.1103/PhysRevB.72.134429

We study dynamical properties of the anisotropic triangular quantum antiferromagnet Cs_2CuCl_4. Inelastic neutron scattering measurements have established that the dynamical spin correlations cannot be understood within a linear spin wave analysis. We go beyond linear spin wave theory by taking interactions between magnons into account in a 1/S expansion. We determine the dynamical structure factor and carry out extensive comparisons with experimental data. We find that compared to linear spin wave theory a significant fraction of the scattering intensity is shifted to higher energies and strong scattering continua are present. However, the 1/S expansion fails to account for the experimentally observed large quantum renormalization of the exchange energies.

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