Abstract
Photoinduced superconductivity has been investigated in YBa 2Cu 3O 6.4 films near to the semiconductor-metal transition. Light-induced changes in the resistance and growth of the diamagnetic moment were observed. The data revealed a dependence between the photoinduced reduction of the normal state resistance and the increase of the onset temperature of superconductivity in the films. Prolonged irradiation led to a seemingly complete loss of resistivity below 5 K. These phenomena are attributed to photogeneration of additional mobile holes in CuO 2 layers resulting in superconductivity.
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