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- W3202135078 abstract "The optimum design of high-sensitivity Superconducting Quantum Interference Devices (SQUIDs) and other devices based on thin HTS films requires accurate inductance modeling. This needs the London penetration depth $lambda$ to be well defined, not only at 77 K, but also for any operating temperature, given the increasingly widespread use of miniature low-noise single-stage cryocoolers. Temperature significantly affects all inductances in any active superconducting device and cooling below 77 K can greatly improve device performance, however accurate data for the temperature dependence of inductance and $lambda(T)$ for HTS devices is largely missing in the literature. We report here inductance measurements on a set of 20 different thin-film YBCO SQUIDs at 77 K with thickness $t = 220$ or 113 nm. By combining experimental data and inductance modeling we find an average penetration depth $lambda(77) = 391$ nm at 77 K, which was independent of $t$. Using the same methods we derive an empirical expression for $lambda(T)$ for a further three SQUIDs measured on a cryocooler from 50 to 79 K. Our measured value of $lambda(77)$ and our inductance extraction procedures were then used to estimate the inductances and the effective areas of directly coupled SQUID magnetometers with large washer-style pick-up loops. The latter agree to better than 7% with experimentally-measured values, validating our measured value of $lambda(77)$ and our inductance extraction methods." @default.
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- W3202135078 date "2021-10-04" @default.
- W3202135078 modified "2023-10-06" @default.
- W3202135078 title "Determining the temperature-dependent London penetration depth in HTS thin films and its effect on SQUID performance" @default.
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- W3202135078 doi "https://doi.org/10.1063/5.0065790" @default.
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