Orbital magnetic moment of a chiral p-wave superconductor

Orbital magnetic moment of a chiral p-wave superconductor
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手征p波超导体的轨道磁矩

DOI:
10.1088/1367-2630/11/5/055063
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发表时间:
2009
影响因子:
3.3
通讯作者:
Annett J
Annett J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Annett J

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超流氦 3 A 相中手性凝聚体的体轨道角动量的存在和大小是一个长期存在争议的问题。手性 p 波超导材料中的类似问题是本体中存在有限轨道磁矩。在Sr 2 RuO 4 中,超导态自发时间反转对称破缺(TRSB)的实验证据强烈表明存在这样的轨道矩,但理论对于该矩的预期大小存在分歧。我们表明,在 Sr 2 RuO 4 的实际能带模型中自然出现非零轨道磁化强度,其温度依赖性在性质上与μ子自旋旋转和克尔效应实验结果相似。产生轨道矩的最简单模型需要每个 Ru 至少有两个简并原子轨道,对应于 Ru d xz 和 d yz 态。这与各向同性超流体 3 He 中的轨道角动量理论或 Sr 2 RuO 4 中的轨道矩模型形成对比,后者假设费米能级仅具有单个能带。探讨了这一令人惊讶的结果的含义。
The existence and magnitude of a bulk orbital angular momentum of the chiral condensate in the A phase of superfluid helium-3 is a longstanding matter of controversy. The analogous problem in a chiral p-wave superconducting material is the existence of a finite orbital magnetic moment in the bulk. In Sr 2 RuO 4, the existence of such an orbital moment is strongly suggested by experimental evidence for spontaneous time-reversal symmetry breaking (TRSB) in the superconducting state, but the theories disagree on the expected magnitude of this moment. We show that a nonzero orbital magnetization density arises naturally in a realistic band model for Sr 2 RuO 4, and its temperature dependence is qualitatively similar to those of the muon spin rotation and Kerr effect experimental results. The simplest model that leads to the orbital moment requires at least two degenerate atomic orbitals per Ru, which correspond to the Ru d xz and d yz states. This is in contrast to the theories of orbital angular momentum in the isotropic superfluid 3 He, or models of orbital moment in Sr 2 RuO 4 which assume only a single band at the Fermi level. The implications of this surprising result are explored.
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