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Antiferromagnetic Heisenberg model on anisotropic triangular lattice in the presence of magnetic field

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arxiv cond-mat/0207056 v1 pith:CGJJ43TT submitted 2002-07-02 cond-mat.str-el cond-mat.mtrl-sci

classification cond-mat.str-elcond-mat.mtrl-sci
keywords fieldanisotropicantiferromagneticheisenberglatticemagneticmodelpresence
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abstract

We use Schwinger boson mean field theory to study the antiferromagnetic spin-1/2 Heisenberg model on an anisotropic triangular lattice in the presence of a uniform external magnetic field. We calculate the field dependence of the spin incommensurability in the ordered spin spiral phase, and compare the results to the recent experiments in Cs$_{2}$CuCl$_{4}$ by Coldea et al. (Phys. Rev. Lett. 86, 1335 (2001)).

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