Spin Structure Factor of the Frustrated Quantum Magnet Cs_2CuCl_4

Details Spin Structure Factor of the Frustrated Quantum Magnet Cs_2CuCl_4 Spin Structure Factor of the Frustrated Quantum Magnet Cs_2CuCl_4

2006-01-20

arxiv.org/abs/cond-mat/0601486v1

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 6 eps figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.73.184403

The ground state properties and neutron structure factor for the two-dimensional antiferromagnet on the triangular lattice, with uni-directional anisotropy in the nearest-neighbor exchange couplings and a weak Dzyaloshinskii-Moriya (DM) interaction, are studied. This Hamiltonian has been used to interpret neutron scattering measurements on the spin 1/2 spiral spin-density-wave system, Cs_2CuCl_4, [R. Coldea, et al., Phys. Rev. B 68, 134424 (2003)]. Calculations are performed using a 1/S expansion, taking into account interactions between spin-waves. The ground state energy, the shift of the ordering wave-vector, Q, and the local magnetization are all calculated to order 1/S^2. The neutron structure factor, obtained using anharmonic spin-wave Green's functions to order 1/S, is shown to be in reasonable agreement with published neutron data, provided that slightly different parameters are used for the exchange and DM interactions than those inferred from measurements in high magnetic field.

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