Orbitally limited pair-density-wave phase of multilayer superconductors
Orbitally limited pair-density-wave phase of multilayer superconductors
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DOI：
10.1103/physrevb.97.144508
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发表时间：
2018-02
影响因子：
3.7
通讯作者：
David Mockli;Y. Yanase;M. Sigrist
中科院分区：
文献类型：
--
作者：
David Mockli;Y. Yanase;M. Sigrist
本文用Ginzburg-Landau方法研究了多层超导体宇称混合对密度波相位中理想超导涡旋晶格的磁场依赖性。在多层体系中，由于局域反演对称性破缺，在外层诱导了Rashba自旋轨道耦合。这与垂直顺磁（泡利）限制磁场相结合，稳定了超导单线态通道中的交错层依赖对密度波相位。高场对密度波相位通过一阶相变与低场BCS相位分离。在本文中的激励指导问题是：什么是必要的最小Maki参数$\alpha_M$的超导三层系统的对密度波相位的外观？为了解决这个问题，我们推广的圆形单元法的规则的磁通线晶格的第二类超导体，包括顺磁退配对效应。然后，我们将该模型应用于三层系统，其中每一层的特征在于由Ginzburg-Landau参数$\kappa_0 $，和一个Maki参数$\alpha_M$。我们发现，当自旋轨道Rashba相互作用与超导凝聚能相比时，当Maki参数$\alpha_M> 10$时，轨道限制对密度波相位趋于稳定.
We investigate the magnetic field dependence of an ideal superconducting vortex lattice in the parity-mixed pair-density wave phase of multilayer superconductors within a circular cell Ginzburg-Landau approach. In multilayer systems, due to local inversion symmetry breaking, a Rashba spin-orbit coupling is induced at the outer layers. This combined with a perpendicular paramagnetic (Pauli) limiting magnetic field stabilizes a staggered layer dependent pair-density wave phase in the superconducting singlet channel. The high-field pair-density wave phase is separated from the low-field BCS phase by a first-order phase transition. The motivating guiding question in this paper is: what is the minimal necessary Maki parameter $\alpha_M$ for the appearance of the pair-density wave phase of a superconducting trilayer system? To address this problem we generalize the circular cell method for the regular flux-line lattice of a type-II superconductor to include paramagnetic depairing effects. Then, we apply the model to the trilayer system, where each of the layers are characterized by Ginzburg-Landau parameter $\kappa_0$, and a Maki parameter $\alpha_M$. We find that when the spin-orbit Rashba interaction compares to the superconducting condensation energy, the orbitally limited pair-density wave phase stabilizes for Maki parameters $\alpha_M> 10$.