Modulation instability of superconducting condensate and magnetization curve in type-II superconductor films

摘要

The influence of the edge barrier on the entry of vortices and on the magnetization curve of superconducting films with thickness smaller than the London depth is studied within Ginzburg-Landau theory. A modulation instability of the superconducting order parameter is predicted to occur at the film edges when the longitudinal component of the kinematic momentum reaches a critical value at the edges. Successive instabilities lead to a sequence of vortex-chain entry fields and to serrations in the magnetization curve. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 3]