Vortex lattice structure dependent on pairing symmetry in Rashba superconductors
Vortex lattice structure dependent on pairing symmetry in Rashba superconductors
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Rashba 超导体中取决于配对对称性的涡晶格结构
DOI：
10.1103/physrevb.80.014501
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
and Ryusuke Ikeda
中科院分区：
文献类型：
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作者：
Norihito Hiasa;Taro Saiki;and Ryusuke Ikeda
基于类BCS哈密顿量和由此得到的Ginzburg-Landau泛函，研究了平行于基面的磁场中Rashba非中心对称超导体的涡旋晶格结构。由于反转对称性的破缺引起塞曼效应的动量各向异性，高场涡旋晶格一般在垂直于的平面上表现出Fulde-Ferrell-Larkin-Ovchinnikov型的单向调制。然而，调制的方向和晶格结构在很大程度上取决于基本的配对对称性：当自旋单态和三态配对成分之间的混合可以忽略时，所得到的调制结构往往具有反射对称性，而在具有显著的单态-三态混合的系统中，涡旋晶格在大多数情况下不具有反射对称性。后者的结果表明，在现实材料中存在两种简并取向的晶格结构，这些晶格结构被磁畴壁隔开，这可能与在文[1]中观察到的极低的磁衰减率有关。
Vortex lattice structures in Rashba noncentrosymmetric superconductors in magnetic fields parallel to the basal planeare examined based on the BCS-like Hamiltonian and the resulting Ginzburg-Landau functional. Due to the momentum-dependent anisotropy of the Zeeman effect induced by the broken inversion symmetry, the vortex lattice in higher fields generally shows some unidirectional modulation of Fulde-Ferrell-Larkin-Ovchinnikov type orienting in the plane perpendicular to. However, the direction of the modulation and the lattice structure depend significantly on the underlying pairing symmetry: when the mixing between spin singlet and triplet pairing components is negligible, the resulting modulated structure tends to have reflection symmetry, while the vortex lattice in systems with a significant singlet-triplet mixing has no reflection symmetry in most cases. The latter result implying the presence inrealmaterials of two degenerate orientations of the lattice structure separated by domain walls may be relevant to the extremely low-magnetic decay rate observed in.