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

Bick, M.; Fardmanesh, M.; Zhang, Y.; Zander, W.; Schubert, J.; Krause, H.-J.; Panaitov, G.; Banzet, M.

doi:10.1109/77.919598

Journal Article

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

Bick, M.FZJ* ; Schubert, J.FZJ* ; Fardmanesh, M.FZJ* ; Panaitov, G.FZJ* ; Banzet, M.FZJ* ; Zander, W.FZJ* ; Zhang, Y.FZJ* ; Krause, H.-J.FZJ*

2001
IEEE New York, NY

IEEE transactions on applied superconductivity 11, 1339 (2001) [10.1109/77.919598]

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Please use a persistent id in citations: http://hdl.handle.net/2128/1977 doi:10.1109/77.919598

Abstract: 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 DeltaB(0-V) leading to an increased white flux noise level or unstable SQUID operation. Here, we report on the investigation of DeltaB(0-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 V,,,,, we opened the SQUID loop of some samples and measured the magnetic field dependence of the critical current I-c(8) 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.

Keyword(s): J ; magnetic field dependence (auto) ; rf-SQUID (auto) ; SEJ (auto)

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Appears in the scientific report 2001
Notes: This version is available at the following Publisher URL: http://ieeexplore.ieee.org/Xplore/dynhome.jsp

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