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

Article

关键词: TRANSITION-METAL OXIDES;    MOTT-INSULATOR;    YVO3;    LATIO3;   

DOI  :  10.1103/PhysRevB.67.100408

来源: SCIE

【 摘 要 】

We study a 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 YVO3.

【 授权许可】

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