Critical behavior in quantum spin chains with composite spin

J. Solyom, J. Timonen

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Composite spin models are constructed such that, by varying two parameters, they interpolate between the spin-(1/2 antiferromagnetic Heisenberg chain and a number of spin-1 models. These include the usual Heisenberg model, the integrable spin-1 model, and the model with an exact valence-bond ground state. Finite-chain calculations are performed on the composite spin model to study its criticality, and to find if the integrable spin-1 model is a multicritical point with a finite gap generated away from it. We find indications for an extended gapless region.

Original languageEnglish
Pages (from-to)7003-7008
Number of pages6
JournalPhysical Review B
Issue number10
Publication statusPublished - Jan 1 1989


ASJC Scopus subject areas

  • Condensed Matter Physics

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