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Free Energy of the Antiferromagnetic Linear Chain
Phys. Rev. 136, A751 – Published 2 November, 1964
DOI: https://doi.org/10.1103/PhysRev.136.A751
Abstract
Rigorous upper and lower bounds for the free energy of the antiferromagnetic Heisenberg linear chain are obtained from general convexity properties of the free energy. The lower bound is here derived; the upper bound has been obtained previously by Bulaevskii. Both are compared with the calculations of Bonner and Fisher for finite chains.
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