%0 Journal Article
%T Low-Temperature Thermodynamics of $A^{(2)}_2$ and su(3)-invariant Spin Chains
%A Luca Mezincescu
%A Rafael I. Nepomechie
%A P. K. Townsend
%A A. M. Tsvelik
%J Physics
%D 1992
%I arXiv
%R 10.1016/0550-3213(93)90006-B
%X We formulate the thermodynamic Bethe Ansatz (TBA) equations for the closed (periodic boundary conditions) $A^{(2)}_2$ quantum spin chain in an external magnetic field, in the (noncritical) regime where the anisotropy parameter $\eta$ is real. In the limit $\eta \to 0$, we recover the TBA equations of the antiferromagnetic 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.
%U http://arxiv.org/abs/hep-th/9212125v1