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Magnetic field behavior of YBCO step-edge Josephson junctions in rf-washer SQUIDs

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8 Author(s)
Bick, M. ; Inst. fur Schicht- und Ionentechnik, Forschungszentrum Julich GmbH, Germany ; Schubert, J. ; Fardmanesh, M. ; Panaitov, G.
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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

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )

Date of Publication:

Mar 2001

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