Vortices in HTS junctions and SQUIDs

Three different problems of a vortex penetrating a superconducting thin film have been addressed. It has been shown that the flux coupled from a vortex into a pickup loop or SQUID washer can be obtained from knowledge of the current distributions which flow in the absence of a vortex, a much easier...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1999-06, Vol.9 (2), p.3741-3744
Main Author: Humphreys, R.G.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit noise
Current distribution
Electronics
Equivalent circuits
Exact sciences and technology
Fluid dynamics
Fluid flow
Geometry
High temperature superconductors
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SQUIDs
Superconducting device noise
Superconducting devices
Superconducting quantum interference devices
Superconducting thin films
Superconductivity
Transformers
Vortices
Washers
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Summary:Three different problems of a vortex penetrating a superconducting thin film have been addressed. It has been shown that the flux coupled from a vortex into a pickup loop or SQUID washer can be obtained from knowledge of the current distributions which flow in the absence of a vortex, a much easier calculation. Results are given for the case of the SQUID washer. The current distribution for a vortex near a circular hole in a film has been found in the strong shielding limit, and the force on the vortex deduced. The current distribution of a Josephson vortex penetrating a planar junction, such as a bicrystal junction, has been calculated. The form of the Josephson vortex is different from that usually assumed, with a long range tail. The size of the Josephson vortex is typically a factor of two larger than that obtained by taking the conventional expression in terms of the Josephson penetration depth.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.783841