Thermodynamics of the bilinear-biquadratic spin one Heisenberg chain

Details Thermodynamics of the bilinear-biquadratic spin one Heisenberg chain Thermodynamics of the bilinear-biquadratic spin one Heisenberg chain

2000-03-07

arxiv.org/abs/cond-mat/0003102v3

Phys. Rev. Lett. 85, 2380 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 postscript figures

Scientific paper

10.1103/PhysRevLett.85.2380

The magnetic susceptibility and specific heat of the one-dimensional S=1 bilinear-biquadratic Heisenberg model are calculated using the transfer matrix renormalization group. By comparing the results with the experimental data of ${\rm LiVGe_2O_6}$ measured by Millet et al. (Phys. Rev. Lett. {\bf 83}, 4176 (1999)), we find that the susceptibility data of this material, after subtracting the impurity contribution, can be quantitatively explained with this model. The biquadratic exchange interaction in this material is found to be ferromagnetic, i.e. with a positive coupling constant.

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