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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., GARCÍA BACH, Ma. de los ángeles. Variational localized-site cluster expansions. X. Dimerization in linear Heisenberg chains. _Physical Review B_. 1979. Vol. 19, núm. 2, pàgs. 877-886. [consulta: 25 de febrer de 2026]. ISSN: 0163-1829. [Disponible a: https://hdl.handle.net/2445/9725]

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