Title:
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Variational localized-site cluster expansions. X. Dimerization in linear Heisenberg chains
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Author:
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Klein, D. J.; García Bach, Ma. de los Ángeles
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Other authors:
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Universitat de Barcelona |
Abstract:
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Ground-state instability to bond alternation in long linear chains is considered from the point of view of valence-bond (VB) theory. This instability is viewed as the consequence of a long-range order (LRO) which is expected if the ground state is reasonably described in terms of the Kekulé states (with nearest-neighbor singlet pairing). It is argued that the bond alternation and associated LRO predicted by this simple, VB picture is retained for certain linear Heisenberg models; many-body VB calculations on spin s=1 / 2 and s=1 chains are carried out in a test of this argument. |
Subject(s):
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-Magnetisme -València (Química) -Clústers -Magnetism -Valence (Theoretical chemistry) -Clústers |
Rights:
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(c) The American Physical Society, 1979
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Document type:
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Article Article - Published version |
Published by:
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The American Physical Society
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