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Magnetic Susceptibility of an integrable anisotropic spin ladder system

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arxiv cond-mat/0302336 v1 pith:FUJZXOQO submitted 2003-02-17 cond-mat.stat-mech

A.P. Tonel , S.R. Dahmen , A. Foerster , A.L. Malvezzi This is my paper
classification cond-mat.stat-mech
keywords magneticspinsusceptibilityladdermodelparameteranisotropicanisotropy
verification ladder T0 review T1 audit T2 compute T3 formal
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We investigate the thermodynamics of a spin ladder model which possesses a free parameter besides the rung and leg couplings. The model is exactly solved by the Bethe Ansatz and exhibits a phase transition between a gapped and a gapless spin excitation spectrum. The magnetic susceptibility is obtained numerically and its dependence on the anisotropy parameter is determined. A connection with the compounds KCuCl3, Cu2(C5H12N2)2Cl4 and (C5H12N)2CuBr4 in the strong coupling regime is made and our results for the magnetic susceptibility fit the experimental data remarkably well.

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