Percolation effects and oxygen inhomogeneities in YBa2Cu3O7-' crystals

M. S. Osofsky, J. L. Cohn, E. F. Skelton, M. M. Miller, R. J. Soulen, S. A. Wolf, T. A. Vanderah

Research output: Contribution to journalArticle

97 Scopus citations

Abstract

The magnetization curves of YBa2Cu3O7-' crystals are widely observed to exhibit a pronounced low-field minimum in the temperature range 30 K<T<Tc. We demonstrate that these magnetization anomalies correlate with the c-axis lattice parameter, and hence with the specific oxygen deficiency '. We interpret this low-field feature in terms of a field-induced decoupling of regions of oxygen-rich material by boundaries of oxygen-poor material, a phenomenon reminiscent of the behavior in granular superconductors. A phase diagram that demarcates the multigrain onset as a function of temperature and ' is then constructed. The shape of the phase boundaries is described using a percolation model. This analysis demonstrates that magnetization is a very sensitive measure of crystal quality.

Original languageEnglish (US)
Pages (from-to)4916-4922
Number of pages7
JournalPhysical Review B
Volume45
Issue number9
DOIs
StatePublished - Jan 1 1992
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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