Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2000-11-14
J.Phys.Soc.Jap. 70 (2001) 367-371
Physics
Condensed Matter
Statistical Mechanics
13 pages, 1 figure, to appear in J. Phys. Soc. Jpn. Vol. 70-2
Scientific paper
10.1143/JPSJ.70.367
This note is a supplement to our previous papers: Mod. Phys. Lett. A14 (1999) 2427 (math-ph/9911010); Int. J. Mod. Phys. A15 (2000) 2329 (math-ph/9912014). The thermodynamic Bethe ansatz (TBA) equation for an integrable spin chain related to the Lie superalgebra osp(1|2) is analyzed. The central charge determined by low temperature asymptotics of the specific heat can be expressed by the Rogers dilogarithmic function, and identified to be 1. Solving the TBA equation numerically, we evaluate the several thermodynamic quantities. The excited state TBA equation is also discussed.
Sakai Kazumitsu
Tsuboi Zengo
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