Transport processes and noise in YBa2Cu3O7-δ grain boundary junctions

R. Gross, B. Mayer

Research output: Contribution to journalArticlepeer-review

160 Scopus citations

Abstract

In the high temperature superconductors the weak link nature of extended defects as grain boundaries is responsible for the deterioration of the superconducting transport properties. From the study of individual grain boundaries in thin-film bicrystals of YBa2Cu3O7-δ general relations describing the superconducting transport and noise characteristics of grain boundaries in the high temperature superconductors were found. Firstly, the critical current density Jgbc decreases as the misorientation angle between the adjoining grains increases. Secondly, the Jgbc ρ{variant}N products, where ρ{variant}N is the normal resistance times unit area of the grain boundaries, scale proportional to about (1/ρ{variant}N)q with q ranging between 1 and 1.5. Thirdly, all grain boundaries show large amounts of low frequency 1/f noise. The transport and noise characteristics can be explained by a junction model which is based on an insulating layer at the grain boundary interface containing a large number of localized defect states.

Original languageEnglish
Pages (from-to)235-242
Number of pages8
JournalPhysica C: Superconductivity and its Applications
Volume180
Issue number1-4
DOIs
StatePublished - Sep 1991
Externally publishedYes

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