Spin order due to orbital fluctuations: cubic vanadates.
Spin order due to orbital fluctuations: cubic vanadates.
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由于轨道涨落而产生的自旋顺序：立方钒酸盐。
DOI：
10.1103/physrevlett.86.3879
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发表时间：
2001
影响因子：
8.6
通讯作者：
A. Oleś
中科院分区：
文献类型：
--
作者：
G. Khaliullin;P. Horsch;A. Oleś
本文研究了立方钒酸盐中的自旋和轨道超交换作用。t（2g）轨道的波动触发了V3+离子沿着立方方向之一的自旋S = 1之间的铁磁相互作用的新机制，该机制在没有Hund规则交换J（H）的情况下已经起作用，并导致LaVO 3中的C型反铁磁相。Jahn-Teller效应可以在低温下稳定轨道有序和G型反铁磁相，但由于轨道涨落导致的大熵在较高温度下再次有利于C相，如YVO（3）中所观察到的那样。
We investigate the highly frustrated spin and orbital superexchange interactions in cubic vanadates. The fluctuations of t(2g) orbitals trigger a novel mechanism of ferromagnetic interactions between spins S = 1 of V3+ ions along one of the cubic directions which operates already in the absence of Hund's rule exchange J(H), and leads to the C-type antiferromagnetic phase in LaVO3. The Jahn-Teller effect can stabilize the orbital ordering and the G-type antiferromagnetic phase at low temperatures, but large entropy due to orbital fluctuations favors again the C phase at higher temperatures, as observed in YVO (3).