1. Josephson systems based on ballistic point contacts between single-band and multi-band superconductors.
- Author
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Yerin, Y. S., Kiyko, A. S., Omelyanchouk, A. N., and Il’ichev, E.
- Subjects
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SUPERCONDUCTORS , *JOSEPHSON effect , *BALLISTICS , *SEMICONDUCTOR junctions , *SUPERCONDUCTING quantum interference devices , *SYMMETRY breaking - Abstract
The Josephson effect in ballistic point contacts between single-band and multi-band superconductors was investigated. It was found that in the case of Josephson junctions formed by a single-band and an s ±-wave two-band superconductor as well as by a single-band and a three-band superconductor the junctions become frustrated, showing the φ-contact properties. Depending on the ground state of a three-band superconductor with time-reversal symmetry breaking, the Josephson junction can have from one to three energy minima, some of which can be locally stable. We also study the behavior of a dc SQUID based on the Josephson junctions between single-band and multi-band superconductors. Some features on the dependences of the critical current and the total magnetic flux on the applied flux of a dc SQUID based on the Josephson point contacts between a singleband superconductor and an s ±-wave superconductor, three-band superconductor with broken timereversal symmetry and three-band superconductor without broken time-reversal symmetry as compared to the conventional dc SQUIDs based on single-band superconductors were found. The results can be used as an experimental tool to detect the existence of multi-band structure and timereversal symmetry breaking. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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