Structural, orbital, and magnetic order in vanadium spinels.
Structural, orbital, and magnetic order in vanadium spinels.
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DOI：
10.1103/physrevlett.93.157206
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发表时间：
2004-01
影响因子：
8.6
通讯作者：
O. Tchernyshyov
中科院分区：
文献类型：
--
作者：
O. Tchernyshyov
钒尖晶石（ZnV 2 O 4，MgV 2 O 4和CdV 2 O 4）表现出一系列的结构和磁性相变，反映了晶格，轨道和自旋自由度的相互作用。我们提出了一个考虑相对论自旋轨道相互作用、集体Jahn-Teller效应和自旋阻挫的理论模型。下面的结构转变，钒离子表现出铁轨道秩序和磁铁最好被视为两套反铁磁链与单离子伊辛各向异性。磁序，参数化的两个伊辛变量，出现在一个四临界点。
Vanadium spinels (ZnV2O4, MgV2O4, and CdV2O4) exhibit a sequence of structural and magnetic phase transitions, reflecting the interplay of lattice, orbital, and spin degrees of freedom. We offer a theoretical model taking into account the relativistic spin-orbit interaction, collective Jahn-Teller effect, and spin frustration. Below the structural transition, vanadium ions exhibit ferro-orbital order and the magnet is best viewed as two sets of antiferromagnetic chains with a single-ion Ising anisotropy. Magnetic order, parametrized by two Ising variables, appears at a tetracritical point.