Edge critical currents of dense Josephson vortex lattice in layered superconductors
Edge critical currents of dense Josephson vortex lattice in layered superconductors
复制标题
层状超导体中密集约瑟夫森涡晶格的边缘临界电流
DOI：
10.1103/physrevb.66.224514
复制
发表时间：
2002
影响因子：
3.7
通讯作者：
A. Koshelev
中科院分区：
文献类型：
--
作者：
A. Koshelev
本文计算了由大磁场B沿沿着原子层状超导体层施加而产生的致密约瑟夫森涡旋晶格的临界电流随场的变化关系。在干净的样品中，由于晶格与边界的相互作用，出现有限的临界电流。边界引起晶格的交替变形，在典型长度下在样品内部衰减，该典型长度大于约瑟夫森长度并且与磁场成比例地增加。这种变形的确切形状和沿着表面流动的总电流由晶格在体块中的位置唯一地确定。总的最大约瑟夫森电流有一个整体的1/B$的依赖性与强振荡。与众所周知的夫琅和费依赖性相反，振荡周期对应于每两个结增加一个通量量子。由于与边界的相互作用，慢晶格运动的磁通流电压也随场振荡，与最近的实验一致。
We calculate the field dependence of the critical current for the dense Josephson vortex lattice which is created by a large magnetic field B applied along the layers of atomically layered superconductors. In clean samples a finite critical current appears due to the interaction of the lattice with the boundaries. The boundary induces an alternating deformation of the lattice decaying inside the sample at the typical length, which is larger than the Josephson length and increases proportionally to the magnetic field. The exact shape of this deformation and the total current flowing along the surface are uniquely determined by the position of the lattice in the bulk. The total maximum Josephson current has an overall $1/B$ dependence with strong oscillations. In contrast to the well-known Fraunhofer dependence, the period of oscillations corresponds to adding one flux quantum per two junctions. Due to the interaction with the boundaries, the flux-flow voltage for slow lattice motion also oscillates with field, in agreement with recent experiments.