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Properties of Grooved Dayem Bridge based YBa$_2$Cu$_3$O$_{7-\delta}$ Superconducting Quantum Interference Devices and Magnetometers

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arxiv 2001.08554 v1 pith:N2TG7ARY submitted 2020-01-23 cond-mat.supr-con

classification cond-mat.supr-con
keywords dayemlinkspropertiesweakbridgedeltadevicesgrooved
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abstract

The transport properties of a YBa$_2$Cu$_3$O$_{7-\delta}$ superconducting quantum interference device (SQUID) based on grooved Dayem bridge weak links are studied as a function of temperature: at high temperatures ($60~$K$<T<T_\mathrm{c}=89$~K) the weak links show properties similar to SNS junctions, while at temperatures below 60~K the weak links behave like short Dayem bridges. Using these devices, we have fabricated SQUID magnetometers with galvanically coupled in-plane pick-up loops: at $T=77$~K, magnetic field white noise levels as low as $63$~fT/$\sqrt{\mathrm{Hz}}$ have been achieved.

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