We investigate the correlation length of the one-dimensional S=1/2 Heisenberg antiferromagnet by the thermal Bethe-ansatz method proposed by Koma. The numerical result shows that the correlation length diverges as {ξ}{~}T^-1 at low temperatures with logarithmic corrections. This logarithmic correction can be explained by conformal field theory.
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Nomura et al. (1991) studied this question.
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