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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/9725
Variational localized-site cluster expansions. X. Dimerization in linear Heisenberg chains
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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.
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KLEIN, D. J. and GARCÍA BACH, Ma. de los Ángeles. Variational localized-site cluster expansions. X. Dimerization in linear Heisenberg chains. Physical Review B. 1979. Vol. 19, num. 2, pags. 877-886. ISSN 0163-1829. [consulted: 10 of June of 2026]. Available at: https://hdl.handle.net/2445/9725