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