2002/12/10 by Karlo Penc, Matthieu Mambrini, Patrik Fazekas +1 · 1 citation
Physics and Astronomy · #cond-mat.str-el #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevb.68.012408
published as Phys. Rev. B 68, 012408 (2003) · 5 pages, 5 figures, RevTex4
arxiv created 2002/12/10 · arxiv updated 2009/11/30
Motivated by the absence of 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 neighbour 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.