Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-01-14
Phys. Rev. B 71, 214426 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
13 Pages, 9 Figures
Scientific paper
10.1103/PhysRevB.71.214426
We present detailed calculations of the magnetic ground state properties of Cs$_2$CuCl$_4$ in an applied magnetic field, and compare our results with recent experiments. The material is described by a spin Hamiltonian, determined with precision in high field measurements, in which the main interaction is antiferromagnetic Heisenberg exchange between neighboring spins on an anisotropic triangular lattice. An additional, weak Dzyaloshinkii-Moriya interaction introduces easy-plane anisotropy, so that behavior is different for transverse and longitudinal field directions. We determine the phase diagram as a function of field strength for both field directions at zero temperature, using a classical approximation as a first step. Building on this, we calculate the effect of quantum fluctuations on the ordering wavevector and components of the ordered moments, using both linear spinwave theory and a mapping to a Bose gas which gives exact results when the magnetization is almost saturated. Many aspects of the experimental data are well accounted for by this approach.
Chalker John T.
Coldea Radu
Veillette Martin Y.
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