Abstract
The paper gives a brief overview of experiments concerned with the metastable photoinduced superconductivity phenomenon that have been recently discovered. As evidenced, illuminating the YBa 2 Cu 3 O 6.4 films by visible light to enhancement of metal properties and occurrence of a superconducting transition at low temperatures. Both the temperature of the onset of a superconducting transition and the superconducting phase space in the films rise with the increase of exposure dose. The phenomena discovered are due to photoexcitation of extra mobile holes in the CuO 2 plane allowing a new metastable superconducting phase to be initiated (photodoping). Also discussed are microscopic mechanisms of photoinduced superconductivity.
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