Defect mechanism of photoinduced superconductivity in YBa{sub {bold 2}}Cu{sub {bold 3}}O{sub {bold 6}+{ital x}}

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.15592· OSTI ID:132872

Federici, J F; Chew, D; Welker, B; Savin, W; Gutierrez-Solana, J; Fink, T ^[1]; Wilber, W ^[2]

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1. Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102 (United States)
2. Physical Science Directorate, Army Research Laboratory, Fort Monmouth, New Jersey 07703-5601 (United States)

Although persistent photoconductivity and photoinduced superconductivity have been experimentally observed in oxygen-deficient and superconducting YBa{sub 2}Cu{sub 3}O{sub 6+{ital 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 YBa{sub 2}Cu{sub 3}O{sub 6+{ital 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 {ital F}-centers under illumination.

• OSTI ID: 132872
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
F CENTERS
HIGH-TC SUPERCONDUCTORS
OXYGEN
PHOTOCONDUCTIVITY
PHOTOLUMINESCENCE
YTTRIUM OXIDES