| Issue |
Europhys. Lett.
Volume 64, Number 1, October 2003
|
|
|---|---|---|
| Page(s) | 111 - 117 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00144-3 | |
| Published online | 01 November 2003 | |
Magnetic susceptibility of an exactly solvable anisotropic spin ladder system
1
Instituto de Física da UFRGS - Av.
Bento Gonçalves 9500, Porto Alegre, RS, Brazil
2
Departamento de Física da UNESP - Av. Eng. Luiz
E. C. Coube s/n Bauru, SP, Brazil
Received:
2
June
2003
Accepted:
14
July
2003
We investigate the thermodynamics of an integrable spin ladder
model which possesses a free parameter besides rung and leg
couplings. The model is exactly solvable by means of 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. The spin gap obtained from the
susceptibility curve and the one obtained from the Bethe ansatz
equations are in very good agreement. Our results for the
magnetic susceptibility fit well the experimental data for the
organometallic compounds 
(Landee C. P. et al. ,
Phys. Rev. B, 63 (2001) 100402(R))
(Hayward C. A., Poilblanc D.
and Lèvy L. P.,
Phys. Rev. B, 54 (1996) R12649,
Chaboussant G. et al. ,
Phys. Rev. Lett., 19 (1997) 925;
Phys. Rev. B, 55 (1997) 3046.)
and
(Watson B. C. et al. ,
Phys. Rev. Lett., 86 (2001) 5168)
in the strong-coupling
regime.
PACS: 75.10.Jm – Quantized spin models / 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 03.65.Fd – Algebraic methods
© EDP Sciences, 2003
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