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Stimulation of critical current and vortices movement in wide microbridges based on epitaxial YBCO films

Wide microbridges made of epitaxial YBCO films were investigated experimentally both under and without 37 GHz microwave irradiation at T=4.2 K. Under weak irradiation enhancement of critical current was observed. Current steps in the I-V characteristics caused by synchronization of Abrikosov vortices flow in microwave field were also found, while in the absence of irradiation the microbridges displayed no Josephson properties.