Abstract
Influence of light on magnetic properties of ceramic high- T c superconductors has been investigated with a SQUID magnetometer having an optical access to the sample space. Our data reveal a light-induced reduction of the magnetic moment just below T c and another change increasing with decreasing temperature below ≅ T c/2. The latter effect has been found in LaBaCuO, BiCaSrCuO and YBaCuO superconductors and is attributed to weakening of intergranular Josephson junctions under illumination. A response, linear to the intensity of visible light, has also been observed in a ceramic YBaCuO SQUID working at T = 77 K.
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