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arXiv 1505.04559cond-mat.supr-con
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Rashba非中心对称超导体涡旋晶格态的准经典分析

Quasiclassical analysis of vortex lattice states in Rashba noncentrosymmetric superconductors

Yuichiro Dan, Ryusuke Ikeda

摘要:

本文采用准经典理论和超导序参量的朗道能级展开相结合的方法,假设$s$ -波对情形,研究了在平行于对称面的磁场作用下,具有Rashba型自旋-轨道耦合的非中心对称超导体中出现的涡旋晶格态。所得的场-温度相图不仅包括一个不连续的过渡,但在不同的涡旋晶格结构之间的连续交叉,而且,进一步,在本方法中,在中间场和低温下发现一个结构过渡线的临界端点。它指出,奇怪的领域依赖的涡旋晶格结构是一个后果的各向异性源于Rashba自旋-轨道耦合,和临界端点有关的螺旋相位调制特有的这些材料在理想的Pauli有限的情况下。此外,还给出了STM实验中可探测的局域态密度的计算结果。

英文摘要:

Vortex lattice states occurring in noncentrosymmetric superconductors with the spin-orbit coupling of Rashba type under a magnetic field parallel to the symmetry plane are examined by assuming the $s$-wave pairing case and in an approach combining the quasiclassical theory with the Landau level expansion of the superconducting order parameter. The resulting field-temperature phase diagrams include not only a discontinuous transition but a continuous crossover between different vortex lattice structures, and, further, a critical end point of a structural transition line is found in an intermediate field and at a low temperature in the present approach. It is pointed out that the strange field dependence of the vortex lattice structure is a consequence of that of an anisotropy stemming from the Rashba spin-orbit coupling, and that the critical end point is related to the helical phase modulation peculiar to these materials in the ideal Pauli-limited case. Further, calculation results on the local density of states detectable in STM experiments are also presented.

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