Low-Temperature Thermodynamics of $A^{(2)}_2$ and su(3)-invariant Spin Chains

Details Low-Temperature Thermodynamics of $A^{(2)}_2$ and su(3)-invariant Spin Chains Low-Temperature Thermodynamics of $A^{(2)}_2$ and su(3)-invariant Spin Chains

1992-12-21

arxiv.org/abs/hep-th/9212125v1

Nucl.Phys. B406 (1993) 681-707

Physics

High Energy Physics

High Energy Physics - Theory

31 pages, UMTG-169

Scientific paper

10.1016/0550-3213(93)90006-B

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.

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