Magnetic-flux patterns on the surface of a type-II superconductor.
Magnetic-flux patterns on the surface of a type-II superconductor.
复制标题
II 型超导体表面的磁通量图案。
DOI：
10.1103/physrevb.46.8621
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
David A. Huse
中科院分区：
文献类型：
--
作者：
David A. Huse
在通过第二类超导体表面的磁通模式主要由表面效应而不是由块体中的磁通模式决定的情况下，存在各种不同的模式。特别是，对于零钉扎和足够小的磁通密度，平面处的磁通晶格与经典的二维电子晶格同构，并且在比体磁通晶格高得多的温度下结晶。在单轴各向异性的伦敦理论中，最近由Sudbo和Brandt计算的磁通线能量表明，对于适合于层状超导体的符号的足够强的各向异性，孤立的块状直线磁通线只有当它几乎平行或几乎垂直于层状超导体时才是稳定的。由Bolle等人在BSCCO上观察到的磁通链。发生在稳定通量线的两个方向都应该存在的区域，因此反映了平行和近垂直的通量线之间的相互作用。
Various regimes exist where the pattern of magnetic flux through the surface of a type-II superconductor is predominantly determined by surface effects and not by the pattern of flux in the bulk. In particular, for zero pinning and small enough flux density, the flux lattice at a flat surface is isomorphic to the classical two-dimensional electron lattice and crystallizes at a much higher temperature than does the bulk flux lattice. Within uniaxially anisotropic London theory, the flux-line energy recently calculated by Sudbo and Brandt shows that for sufficiently strong anisotropy of the sign appropriate for layered superconductors an isolated straight flux line in the bulk is only stable when it is either nearly parallel or nearly perpendicular to the layers. The flux chains'' observed on BSCCO by Bolle {ital et} {ital al}. occur in a regime where both orientations of stable flux lines should be present and thus reflect the interactions between parallel and nearly perpendicular flux lines.