Palau A, Dinner R, Durrell J H, Blamire M G
Department of Materials Science, Cambridge University, Pembroke Street, Cambridge CB2 3QZ, United Kingdom.
Phys Rev Lett. 2008 Aug 29;101(9):097002. doi: 10.1103/PhysRevLett.101.097002. Epub 2008 Aug 26.
In technological superconductors, the Lorentz force on the flux vortices is opposed by inhomogeneous pinning and so the critical current may be controlled by a combination of vortex entanglement, cutting, and cross-joining. To understand the roles of these processes we report measurements of structures in which a weak pinning layer is sandwiched between two strongly pinning leads. Quantitative modeling of the results demonstrates that in such systems the critical current is limited by the deformation of individual vortices and not by subsequent cross-joining processes.
在技术超导体中，磁通涡旋上的洛伦兹力受到非均匀钉扎的阻碍，因此临界电流可以通过涡旋缠结、切割和交叉连接的组合来控制。为了理解这些过程的作用，我们报告了对一种结构的测量，其中一个弱钉扎层夹在两个强钉扎引线之间。对结果的定量建模表明，在这种系统中，临界电流受单个涡旋变形的限制，而不是受随后的交叉连接过程的限制。
