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We study dynamical properties of the anisotropic triangular quantum antiferromagnet Cs2CuCl4. 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 1S 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 1S expansion fails to account for the experimentally observed large quantum renormalization of the exchange energies. © 2005 The American Physical Society

physical review. b, condensed matter and materials physics

Spin dynamics of the quasi-two-dimensional spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mstyle scriptlevel="1"><mml:mfrac bevelled="false"><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:mstyle></mml:math>quantum magnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Cs</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuCl</mml:mi><mml:mn>4</mml:mn></…

Spin dynamics of the quasi-two-dimensional spin-12quantum magnetCs2CuCl4