Defect mechanism of photoinduced superconductivity in YBa2Cu3O6+x
J. F. Federici, D. Chew, B. Welker, W. Savin, J. Gutierrez-Solana, T. Fink, W. Wilber
DOI 10.1103/PhysRevB.52.15592 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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