Critical currents and critical fields in composite Al-Ge films

Y. Ashkenazy*, R. Rosenbaum, D. Stroud

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Lee and Stroud (1992) have predicted that the critical current I c(B) in a composite superconducting material should display a constant Value in moderately high magnetic fields, giving rise to a 'plateau region'. Critical current measurements on granular metallic Al-Ge films, located considerably above the metal-insulator transition (MIT), display well defined plateaus. And these measurements confirm most of the Lee-Stroud predictions. In contrast, films located just above the MIT exhibit continuously decreasing critical currents with increasing magnetic fields. These results are explained using a tunnelling junction model proposed by Peterson and Ekin and extended by Papa and Altshuler. From the fitting results, a simple picture. Involving both models, emerges. Which explains the behaviour of Ic versus magnetic field in pressed powdered YBCO samples and in Ag-sheathed Bi-based HTC wires, as well as in the Al-Ge films.

Original languageAmerican English
Article number019
Pages (from-to)7993-8014
Number of pages22
JournalJournal of Physics Condensed Matter
Issue number39
StatePublished - 1994
Externally publishedYes


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