Magnetic Susceptibility of an integrable anisotropic spin ladder system

Details Magnetic Susceptibility of an integrable anisotropic spin ladder system Magnetic Susceptibility of an integrable anisotropic spin ladder system

2003-02-17

arxiv.org/abs/cond-mat/0302336v1

EUROPHYSICS LETTERS 64 (1): 111-117 (2003)

Physics

Condensed Matter

Statistical Mechanics

12 pages, 12 figures included, submitted to Phys. Rev. B

Scientific paper

10.1209/epl/i2003-00144-3

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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