Low-temperature thermodynamics of A2 (2) and su(3)-invariant integrable spin chains

Alexandru Mezincescu, Rafael Nepomechie, P. K. Townsend, A. M. Tsvelik

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Abstract

We formulate the thermodynamic Bethe ansatz (TBA) equations for the closed (periodic boundary conditions) A2 (2) quantum spin chain in an external magnetic field, in the (noncritical) regime where the anisotropy parameter η is real. In the limit η → 0, we recover the TBA equations of the antiferromagnetic integrable su(3)-invariant chain in the fundamental representation. We solve these equations for low temperature and small field, and calculate the specific heat and magnetic susceptibility.

Original languageEnglish (US)
Pages (from-to)681-707
Number of pages27
JournalNuclear Physics B
Volume406
Issue number3
DOIs
StatePublished - Oct 4 1993

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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