Ground states of a frustrated spin-1/2 antifferomagnet: Cs_2CuCl_4 in a magnetic field

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dc.creatorVeillette, M. Y.
dc.creatorChalker, J. T.
dc.creatorColdea, R.
dc.date2005-01-14
dc.date.accessioned2026-07-07T06:27:11Z
dc.date.available2026-07-07T06:27:11Z
dc.descriptionWe 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.
dc.description13 Pages, 9 Figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0501347
dc.identifierhttp://arxiv.org/abs/cond-mat/0501347
dc.identifierPhys. Rev. B 71, 214426 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.214426
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97340
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleGround states of a frustrated spin-1/2 antifferomagnet: Cs_2CuCl_4 in a magnetic field
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