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- W2040602641 abstract "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 Kekul'e 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 $s=frac{1}{2}$ and $s=1$ chains are carried out in a test of this argument." @default.
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- W2040602641 date "1979-01-15" @default.
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- W2040602641 title "Variational localized-site cluster expansions. X. Dimerization in linear Heisenberg chains" @default.
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- W2040602641 doi "https://doi.org/10.1103/physrevb.19.877" @default.
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