Magnetic Susceptibility of an integrable anisotropic spin ladder system

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 obtain...

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Bibliographic Details
Published in:arXiv.org 2003-02
Main Authors: Tonel, A P, Dahmen, S R, Foerster, A, Malvezzi, A L
Format: Article
Language:English
Subjects:
Anisotropy
Coupling (molecular)
Couplings
Dependence
Excitation spectra
Magnetic permeability
Magnetism
Mathematical models
Parameters
Phase transitions
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.0302336