Anomalous low-temperature specific heat of the antiferromagnetic SU(N) Heisenberg model in a field

Details Anomalous low-temperature specific heat of the antiferromagnetic SU(N) Heisenberg model in a field Anomalous low-temperature specific heat of the antiferromagnetic SU(N) Heisenberg model in a field

1993-12-11

arxiv.org/abs/cond-mat/9312046v1

Physics

Condensed Matter

10 Pages, Latex file, Ewha Preprint-001

Scientific paper

We discuss the low-temperature specific heat of the integrable SU(N)- invariant Heisenberg model in one dimension with degrees of freedom in the symmetric rank-$m$ tensor representation, especially for the antiferromagnetic coupling. It is known that the linear specific heat coefficient $\gam$ is a function of a field which breaks the SU(N) invariance of the internal degrees of freedom. We calculate the $\gam$ in a zero field and in a small field. The in-field $\gam$ is less than the zero-field $\gam$ as expected since the entropy is reduced in the ordered system. The zero-field $\gam$ is the same as the one obtained by the prediction of the critical behavior of 1D quantum spin systems via conformal field theory. This extends the previous results for N=2 to an arbitrary N.

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