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arXiv 0905.1132cond-mat.supr-con
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自旋三重态超导体中的分数涡旋晶格结构

Fractional vortex lattice structures in spin triplet superconductors

Suk Bum Chung, Daniel F. Agterberg, Eun-Ah Kim

摘要:

最近的兴趣在自旋三重态超导体的动机,我们调查这类非常规超导体的涡旋晶格结构。我们讨论了序参量对称性如何导致U(1)$\times$ U(1)对称性,使半量子涡旋(HQV)成为拓扑稳定的.然后,我们计算的涡旋晶格结构的HQV的,特别注意的作用,晶格,塞曼耦合,和迈斯纳屏蔽,所有缺席旋量凝聚。最后,我们考虑了自旋-轨道耦合如何导致自由能的U(1)$\times$ U(1)对称性的破坏,以及HQV晶格是否能经受住这种对称性破坏。作为例子,我们研究更简单的自旋三重态模型提出的背景下NaxCoO 2 $\cdot$ yH 2 O和Bechgaard盐,以及更好地了解和更复杂的模型Sr 2 RuO 4。

英文摘要:

Motivated by recent interest in spin triplet superconductors, we investigate the vortex lattice structures for this class of unconventional superconductors. We discuss how the order parameter symmetry can give rise to U(1)$\times$U(1) symmetry in same sense as in spinor condensates, making half-quantum vortices (HQV) topologically stable. We then calculate the vortex lattice structure of HQV's, with particular attention on the roles of the crystalline lattice, the Zeeman coupling, and Meissner screening, all absent in spinor condensates. Finally, we consider how spin-orbit coupling leads to a breakdown of the U(1)$\times$U(1) symmetry in free energy and whether the HQV lattice survives this symmetry breaking. As examples, we examine simpler spin-triplet models proposed in the context of NaxCoO2$\cdot$yH2O and Bechgaard salts, as well as the better known and more complex model for Sr2RuO4.

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