Superconducting quantum interference devices based on YBaCuO nanobridges

M.V. Pedyash, David H.A. Blank, Horst Rogalla

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Direct current SQUIDs based on YBaCuO thin film nanobridges have been investigated. Critical current densities Jc of the devices are up to 3 × 106 A/cm2 at T=77 K and show a temperature dependence of (1 ¿ T/Tc)1.6 ± 0.1. High values of the voltage-flux modulation are observed (8 µV peak to peak at 77 K, 45 µV 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 SS[prime]S type junction with decreasing temperature
Original languageEnglish
Pages (from-to)1156-1158
Number of pages3
JournalApplied physics letters
Issue number8
Publication statusPublished - 1996


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