Defect mechanism of photoinduced superconductivity in YBa{sub 2}Cu{sub 3}O{sub x}

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:549860

Chew, D C; Federici, J F; Gutierrez-Solana, J; Molina, G; Savin, W ^[1]; Wilber, W ^[2]

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1. New Jersey Inst. of Technology, Newark, NJ (United States). Dept. of Physics
2. Army Research Lab., Fort Monmouth, NJ (United States). Physical Science Directorate

Persistent photoconductivity and photoinduced superconductivity have been previously observed in various stoichiometries of YBa{sub 2}Cu{sub 3}O{sub x}. The physical mechanism which is responsible for these effects is still under debate. Through an investigation of laser ablated YBa{sub 2}Cu{sub 3}O{sub x} thin film compositions, photoluminescence spectra and infrared spectroscopy, the possibility that the mechanism may be defect related has been supported. A correlation between photoluminescence spectra and wavelength dependence support an oxygen defect model of photoinduced persistent conductivity and superconducting in which the oxygen vacancies act as weakly luminescent F-centers and F{sup +}-centers under illumination. Upon infrared illumination the trapped electrons are photoexcited resulting in a partial quenching of the persistent photoconductivity state.

• Sponsoring Organization: National Science Foundation, Washington, DC (United States)
• OSTI ID: 549860
• Report Number(s): CONF-960163--; ISBN 0-8194-2070-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
CRYSTAL DEFECTS
EXPERIMENTAL DATA
PHOTOCONDUCTIVITY
SUPERCONDUCTIVITY
YTTRIUM OXIDES