期刊论文详细信息
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】
Free