Entropy Driven Dimerization in a One-Dimensional Spin-Orbital Model

Details Entropy Driven Dimerization in a One-Dimensional Spin-Orbital Model Entropy Driven Dimerization in a One-Dimensional Spin-Orbital Model

2002-12-16

arxiv.org/abs/cond-mat/0212368v1

Phys. Rev. B 67, 100408 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.67.100408

We study a new version of the one-dimensional spin-orbital model with spins S=1 relevant to cubic vanadates. At small Hund's coupling J_H we discover dimerization in a pure electronic system solely due to a dynamical spin-orbital coupling. Above a critical value J_H, 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 YVO_3.

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