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arXiv 1402.6027cond-mat.supr-con
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非中心对称超导体孪晶界临界场中螺旋相的特征

Signatures of the Helical Phase in the Critical Fields at Twin Boundaries of Non-Centrosymmetric Superconductors

Kazushi Aoyama, Lucile Savary, Manfred Sigrist

摘要:

非中心对称材料中的畴表示不同晶体结构和自旋轨道耦合的区域。在非中心对称的超导体中,分离这种畴的孪晶边界显示出不寻常的性质,其中磁电效应影响局部的上下临界磁场。作为一个模型系统,我们研究了具有四角晶系晶体结构和Rashba自旋轨道耦合(RSOC)的NCS,以及与它们的基面平行的孪晶界。在那里,我们报告说,有两种类型的这样的孪生边界分离域的相对RSOC。在平行于基面的磁场中,自旋极化和超电流之间的磁电耦合在这些孪晶界处感应出有效的磁场。我们表明,这会导致不寻常的影响,在这样的超导体,特别是修改的上,下临界场,在依赖于类型的孪晶界的方式,详细分析,无论是解析和数值。这些影响的实验意义进行了讨论。

英文摘要:

Domains in non-centrosymmetric materials represent regions of different crystal structure and spin-orbit coupling. Twin boundaries separating such domains display unusual properties in non-centrosymmetric superconductors (NCS), where magneto-electric effects influence the local lower and upper critical magnetic fields. As a model system, we investigate NCS with tetragonal crystal structure and Rashba spin-orbit coupling (RSOC), and with twin boundaries parallel to their basal planes. There, we report that there are two types of such twin boundaries which separate domains of opposite RSOC. In a magnetic field parallel to the basal plane, magneto-electric coupling between the spin polarization and supercurrents induces an effective magnetic field at these twin boundaries. We show this leads to unusual effects in such superconductors, and in particular to the modification of the upper and lower critical fields, in ways that depend on the type of twin boundary, as analyzed in detail, both analytically and numerically. Experimental implications of these effects are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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