Spin-Peierls transition in Heisenberg chains with quantum spin

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Finite-size scaling calculations for deformable Heisenberg chains with spin value S=(1/2, 1, (3/2, and 2 indicate that as far as the spin-Peierls transition is concerned, the model with any spin S>(1/2 behaves differently from the S=(1/2 situation. For S=(1/2 the ground state of the isotropic antiferromagnetic or planar models is dimerized, irrespective of the strength of the elastic constant. On the other hand, from the extrapolation of finite-chain results it seems that for any higher-spin value the dimerized and uniform phases are separated by a finite critical value of the elastic constant, and the transition is discontinuous.

Original languageEnglish
Pages (from-to)5781-5786
Number of pages6
JournalPhysical Review B
Issue number10
Publication statusPublished - Jan 1 1988


ASJC Scopus subject areas

  • Condensed Matter Physics

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