Defect mechanism of photoinduced superconductivity in YBa2Cu3Ox

Denise C. Chew; John F. Federici; J. Gutierrez-Solana; G. Molina; William Savin; W. D. Wilber

doi:10.1117/12.241780

10 June 1996 Defect mechanism of photoinduced superconductivity in YYBa₂Cu₃O_x

Denise C. Chew, John F. Federici, J. Gutierrez-Solana, G. Molina, William Savin, W. D. Wilber

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241780
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

Persistent photoconductivity and photoinduced superconductivity have been previously observed in various stoichiometries of YBa₂Cu₃O_x. The physical mechanism which is responsible for these effects is still under debate. Through an investigation of laser ablated YBa₂Cu₃O_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 superconductivity in which the oxygen vacancies act as weakly luminescent F-centers and F⁺-centers under illumination. Upon infrared illumination the trapped electrons are photoexcited resulting in a partial quenching of the persistent photoconductivity state.

Citation Download Citation

Denise C. Chew, John F. Federici, J. Gutierrez-Solana, G. Molina, William Savin, and W. D. Wilber "Defect mechanism of photoinduced superconductivity in YYBa₂Cu₃O_x", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241780

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