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Deviation From Fraunhofer-Type Modulation of Josephson Current Through Niobium Tunnel Junctions by Applying Vertical Magnetic Field

Anomalous modulation characteristics of Josephson current I c through a niobium tunnel junction have been measured by applying the external magnetic field in perpendicular direction. Josephson current I c through a superconducting niobium/aluminum-oxide/niobium tunnel junction is modulated by applyi...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2016-04, Vol.26 (3), p.1-6
Main Authors: Nakayama, Akiyoshi, Abe, Susumu, Watanabe, Norimichi
Format: Article
Language:English
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Summary:Anomalous modulation characteristics of Josephson current I c through a niobium tunnel junction have been measured by applying the external magnetic field in perpendicular direction. Josephson current I c through a superconducting niobium/aluminum-oxide/niobium tunnel junction is modulated by applying the parallel magnetic field (H x , H y ) and the vertical field H z to the junction plane using three pairs of Helmholtz coils. Modulation characteristics of the I c value upon the vertical field H z have hysteresis. Before applying the vertical field H z , the I c - (H x , H y ) dependences are the product of the two Fraunhofer diffraction patterns in the H x and H y directions parallel to each edge of the square-shaped junction and show a square-shaped main peak area. After applying the vertical field H z more than 5000 A/m, during the removing process of this vertical field H z , the I c - (H x , H y ) modulation pattern shows a triangle-shaped main peak area due to the remained trapping and shielding magnetic flux at niobium electrodes.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2016.2537147