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Photoirradiation Effect on Magnetic Susceptibility in Organic Superconductors

Photoirradiation effects on magnetic susceptibility are studied in organic superconductors of κ-(BEDT-TTF)2Cu[N(CN)2]Br and β-(BEDT-TTF)2I3 (BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene), for which we have reported photoresponses of the electrical conductivity elsewhere. With photoirradiation by cw visible laser light, the diamagnetic susceptibility originating from Meissner effect is reduced, indicating that the percentage of superconducting volume decreases with photoirradiation. These results agree with the ones of the time-resolved photoresponse measurements of the electrical conductivity using pulsed laser light.