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Entropy driven dimerization in a one-dimensional spin-orbital model

J. Sirker and G. Khaliullin
Phys. Rev. B 67, 100408(R) – Published 28 March 2003
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Abstract

We study a version of the one-dimensional spin-orbital model with spins S=1 relevant to cubic vanadates. At small Hund’s coupling JH we discover dimerization in a pure electronic system solely due to a dynamical spin-orbital coupling. Above a critical value JH, a uniform ferromagnetic state is stabilized at zero temperature. More surprisingly, we observe a temperature driven dimerization of the ferrochain, which occurs due to a large entropy released by dimer states. This dynamical dimerization seems to be the mechanism driving the peculiar intermediate phase of YVO3.

  • Received 16 December 2002

DOI:https://doi.org/10.1103/PhysRevB.67.100408

©2003 American Physical Society

Authors & Affiliations

J. Sirker1 and G. Khaliullin2

  • 1Theoretische Physik I, Universität Dortmund, Otto-Hahn-Strasse 4, D-44221 Dortmund, Germany
  • 2Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, GermanyKazan Physical-Technical Institute of the Russian Academy of Sciences, 420029 Kazan, Russia

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Vol. 67, Iss. 10 — 1 March 2003

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