Correlation length and free energy of theS=1/2XXZchain in a magnetic field
- 1 December 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 44 (22) , 12382-12394
- https://doi.org/10.1103/physrevb.44.12382
Abstract
The correlation length and the free energy of the S=1/2 XXZ chain in a magnetic field in the z direction are calculated with use of a set of equations for a series of infinite numbers. These are derived by the Bethe-ansatz method for the quantum transfer matrix. The equations for free energy should be equivalent to the thermodynamic Bethe-ansatz nonlinear integral equations. A numerical method that calculates precisely the free energy and the correlation length is given.Keywords
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