A reply to the comments of Johnson et al. on the thermodynamics of the Heisenberg-Ising ring for |Δ|<1 |
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Authors: | M. Takahashi |
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Affiliation: | Department of Physics, College of General Education, Osaka University, Toyonaka, Osaka, Japan; Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo, Japan |
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Abstract: | An improved set of integral equations for the thermodynamics of the Heisenberg-Ising chain for |Δ|<1 is given under some new assumptions. This yields the high-temperature expansion of the free energy correctly, at least, up to the second term. |
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