Superconducting quantum interference devices based on YBaCuO nanobridges
نویسندگان
چکیده
Direct current SQUIDs based on YBaCuO thin film nanobridges have been investigated. Critical current densities Jc of the devices are up to 3310 6 A/cm at T577 K and show a temperature dependence of (12T/Tc) . High values of the voltage-flux modulation are observed ~8 mV peak to peak at 77 K, 45 mV at 4.2 K!. The temperature dependence of the SQUID modulation is found to be essentially different from the one of the conventional weak link SQUID. We discuss our results by considering degradation of the nanobridge area during structuring, which leads to a transition from SNS to SS8S type junction with decreasing temperature. © 1996 American Institute of Physics. @S0003-6951~96!02608-5#
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