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.
ASJC Scopus subject areas
- Nuclear and High Energy Physics