理想第二类超导薄膜的纵场临界电流

本文分析了一个在纵向磁场H_e中,载流的理想第二类超导薄膜(ξ(T)《d≤λ(T))的混合态结构。指出,只有当H_e>(H_c1)(d)时,超导膜的混合态才具有无阻负载电流的能力。本文得到的纵场临界电流曲线具有复杂的结构,并且一般均呈现峰值效应。Heaton及Rose-Innes测得的Nb₅₅Ta₄₅合金的I_c-H_e曲线和d>5λ时的理论曲线相比较,在主要特征上是相同的。关键词：

THE LONGITUDINAL CRITICAL CURRENT OF A THIN FILM OF TYPE II SUPERCONDUCTORS

The structure of the mixed state of a current-carrying thin film of ideal type II superconductors in longitudinal magnetic field H_e is analysed. We show that the lossless current flow through the films in the mixed state is possible only if H_e is larger than H_c1)(d). The curves of longitudinal critical current obtained have complex structure and show peak effect in general. The main feature of the theoretical I_c-H_e curve of the films with thickness d larger than 5λ is identical with that observed by Heaton and Rose-Innes in Nb₅₅Ta₄₅ alloys.