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