Defect mechanism of photoinduced superconductivity in YBa2Cu3O6+x

J. F. Federici, D. Chew, B. Welker, W. Savin, J. Gutierrez-Solana, T. Fink, W. Wilber

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41 Scopus citations

Abstract

Although persistent photoconductivity and photoinduced superconductivity have been experimentally observed in oxygen-deficient and superconducting YBa2Cu3O6+x, the mechanism which is responsible for these effects is still under debate. The possibility of a defect related mechanism in laser-deposited thin films of YBa2Cu3O6+x is studied using four-point resistivity and photoluminescence techniques. It is found that there is a correlation between the photoluminescence spectrum and the wavelength dependence of the photoinduced conductivity. Peaks in the luminescence spectrum change intensity upon initiation of the photoinduced state. These results support an oxygen vacancy defect model of photoinduced persistent conductivity and superconductivity in which the oxygen vacancies act as weakly luminescent F-centers under illumination.

Original languageEnglish (US)
Pages (from-to)15592-15597
Number of pages6
JournalPhysical Review B
Volume52
Issue number21
DOIs
StatePublished - Jan 1 1995

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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