论文标题
螺旋磁场和非中心超导体中涡流的结合状态
Spiral magnetic field and bound states of vortices in noncentrosymmetric superconductors
论文作者
论文摘要
我们讨论了具有手性八面体和四面体（$ o $或$ o $或$ t $）对称性的非中心超级导体中产生的非常规磁反应和涡流状态。我们在微观上得出了金茨堡 - 兰自由能。结果表明，由于旋转轨道和Zeeman耦合磁反应，该系统的磁反应可以随温度而发生很大变化。为了足够强大的耦合，这导致从升高温度下的1型超导性到较低温度下的涡旋状态的交叉。此类超导体中的外部磁场衰减没有简单的指数定律。我们表明，在伦敦限制中，可以根据$ \ nabla \ nabla \ times \ vec {w} = \ text {const} \ vec {w} $定义磁场$ \ vec {w} $。使用该方法，我们证明了涡流的磁场在螺旋中衰减。由于磁场的这种行为，干预层和涡流 - 边界相互作用与多个最小值的非单调性变为非单调。这意味着涡旋形成了与其他涡流，抗生效和边界形成绑定的状态。
We discuss the unconventional magnetic response and vortex states arising in noncentrosymmetric superconductors with chiral octahedral and tetrahedral ($O$ or $T$) symmetry. We microscopically derive Ginzburg-Landau free energy. It is shown that due to spin-orbit and Zeeman coupling magnetic response of the system can change very significantly with temperature. For sufficiently strong coupling this leads to a crossover from type-1 superconductivity at elevated temperature to vortex states at lower temperature. The external magnetic field decay in such superconductors does not have the simple exponential law. We show that in the London limit, magnetic field can be solved in terms of complex force-free fields $\vec{W}$, which are defined by $\nabla \times \vec{W} = \text{const} \vec{W}$. Using that we demonstrate that the magnetic field of a vortex decays in spirals. Because of such behavior of the magnetic field, the intervortex and vortex-boundary interaction becomes non-monotonic with multiple minima. This implies that vortices form bound states with other vortices, antivortices, and boundaries.
