Magnetic field behavior of YBCO step-edge Josephson junctions in rf-washer SQUIDs
IEEE Transactions on Applied Superconductivity
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/27613
The suppression of the critical current in YBCO Josephson junctions by the Earth's magnetic field strongly affects the operation of SQUIDs outside magnetic shielding. Commonly, one observes a modulation of the SQUID flux-voltage transfer function amplitude, Vsq-pp, with a period of ΔB0-V leading to an increased white flux noise level or unstable SQUID operation. Here, we report on the investigation of ΔB0-V of rf-SQUID sensors based on step edge junctions (SEJ) operated in a flip chip configuration with coplanar resonators with integrated flux concentrators. To investigate the origin of the suppression of Vsq-pp, we opened the SQUID loop of some samples and measured the magnetic field dependence of the critical current Ic(B) directly and compared it to Vsq-pp(B). It is shown that a junction width in the submicrometer scale is required for operation of the sensors in the Earth's magnetic field.
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