Quantum phase transition in the SU(4) spin-orbital model on the triangular lattice

Karlo Penc, Matthieu Mambrini, Patrik Fazekas, and Frédéric Mila
Phys. Rev. B 68, 012408 – Published 21 July 2003
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Abstract

Motivated by the absence of a cooperative Jahn-Teller effect in LiNiO2 and BaVS3, two layered oxides with triangular planes, we study the SU(4) symmetric spin-orbital model on the triangular lattice. Upon reducing the next-nearest-neighbor coupling, we show that the system undergoes a quantum phase transition to a liquid phase. A variational approach to this liquid phase shows that simple types of long-range correlations are suppressed, suggesting that it is stable against lattice distortions.

  • Received 7 May 2003

DOI:https://doi.org/10.1103/PhysRevB.68.012408

©2003 American Physical Society

Authors & Affiliations

Karlo Penc1,2, Matthieu Mambrini3, Patrik Fazekas2, and Frédéric Mila4

  • 1Max-Planck-Insitut für Physik Komplexer Systeme, Nöthnitzer Strasse 38, 01187 Dresden, Germany
  • 2Research Institute for Solid State Physics and Optics, H-1525 Budapest, P.O.B. 49, Budapest, Hungary
  • 3Laboratoire de Physique Quantique, Université Paul Sabatier, 31062 Toulouse Cedex 04, France
  • 4Institut de Physique Théorique, Université de Lausanne, CH-1015 Lausanne, Switzerland

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Issue

Vol. 68, Iss. 1 — 1 July 2003

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