Integral equations for thermodynamics of the osp(1|2s) integrable spin chain

Details Integral equations for thermodynamics of the osp(1|2s) integrable spin chain Integral equations for thermodynamics of the osp(1|2s) integrable spin chain

2002-09-13

arxiv.org/abs/math-ph/0209024v1

Phys.Lett. B544 (2002) 222-230

Physics

Mathematical Physics

13 pages, 1 figure, to appear in Phys. Lett. B 544 (2002) 222-230

Scientific paper

10.1016/S0370-2693(02)02463-2

We propose a system of nonlinear integral equations (NLIE), which gives the free energy of the osp(1|2s) integrable spin chain at finite temperatures. In contrast with usual thermodynamic Bethe ansatz equations, our new NLIE contain only a finite number of unknown functions. On deriving NLIE, we use our osp(1|2s) version of the T-system and the quantum transfer matrix method. Based on our NLIE, we also calculate the high temperature expansion of the free energy and the specific heat.

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