Abstract
DC-SQUIDs based on Y 1Ba 2Cu 3O 7−x-thin films prepared by laser ablation and dc-magnetron sputtering, were investigated. The films exhibit transition temperatures of T co=88K and critical current densities at T=77K of j c(77K)=10 6Acm -2. The Josephson junctions were formed at a step on the MgO-substrate surface. The SQUID's were patterned with a focused Nd:YAG-laser beam. The properties of the thin film Josephson junctions were compared with RSJ-like grain boundary weak links, which have been investigated using the break junction method. The SQUID's show a clear flux modulation, the 1/f-noise intercept point was f=10kHz. The following parameters of the SQUID's were obtained at T=40K in the white noise region: a voltage-flux-transfer function of 20μV/Φ 0, a flux resolution of 5·10 -6Φ 0/Hz 1 2 , and an energy resolution of 6·10 -29 J/Hz with a SQUID-loop inductance of L=30pH.
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