Abstract
We show through photoexcitation experiments carried out on YBa 2Cu 3O x c-axis oriented films that photoinduced phenomena are not restricted to insulating samples. Superconducting films with critical temperatures varying between 2 K and 40 K show a clear enhancement of the superconducting transition after illumination. The increase in T c is accompanied by a corresponding decrease in the resistivity ρ, and an increase in the Hall coefficient R H , indicative of an increased carrier density. Furthermore, the carrier mobility is also affected by illumination.
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