Spin-orbit coupling in d2 ordered double perovskites

被引:132
|
作者
Chen, Gang [1 ,2 ]
Balents, Leon [3 ,4 ]
机构
[1] Univ Colorado, Dept Phys, Boulder, CO 80309 USA
[2] Univ Colorado, JILA, Boulder, CO 80309 USA
[3] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA
[4] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA
来源
PHYSICAL REVIEW B | 2011年 / 84卷 / 09期
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevB.84.094420
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We construct and analyze a microscopic model for insulating rock-salt ordered double perovskites, with the chemical formula A(2)BB'O-6, where the magnetic ion B' has a 4d(2) or 5d(2) electronic configuration and forms a face-centered cubic lattice. For these B' ions, the combination of the triply degenerate antisymmetric two-electron orbital states and strong spin-orbit coupling forms local quintuplets with an effective spin moment j = 2. Moreover, due to strongly orbital-dependent exchange, the effective spins have substantial biquadratic and bicubic interactions (fourth and sixth order in the spins, respectively). This leads, at the mean-field level, to a rich ground-state phase diagram, which includes seven different phases: a uniform ferromagnetic phase with an ordering wave vector p = 0 and uniform magnetization along the [111] direction, four two-sublattice phases with an ordering wave vector p = 2 pi(001), and two four-sublattice antiferromagnetic phases. Among the two-sublattice phases, there is a quadrupolar ordered phase that preserves time-reversal symmetry. By extending the mean-field theory to finite temperatures, we find 10 different magnetization processes with different magnetic thermal transitions. In particular, we find that thermal fluctuations stabilize the two-sublattice quadrupolar ordered phase in a large portion of the phase diagram. Existing and possible future experiments are discussed in light of these theoretical predictions.
引用
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页数:13
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