CMT55
Josephson Effects in Superconducting Conventional/Unconventional Tunnel Junctions and Weak-links
- Author(s):
S.-K. Yip, Y. Sun and J. A. Sauls
- Address: Department of Physics & Astronomy, Northwestern University, Evanston, IL 60208
- Date: February 2, 1994
- Journal:
Physica B: Cond. Mat. 196, 1969-197 (1994)
[DOI]
- Abstract:
The a.c. Josephson effect is perhaps the most striking manifestation of long-range phase coherence
(broken gauge symmetry) in superconductors. Superconductivity in which gauge symmetry is broken in
combination with one or more additional symmetries of the normal metallic state (unconventional
superconductivity) may also occur. We discuss the Josephson effect for several models of an
unconventional superconductor in contact with a conventional superconductor. An unconventional
order parameter leads to qualitative changes in the current-phase relation which could be detected
with a SQUID in which one arm of the interferometer is an unconventional superconductor. We also
compare the current-phase relation for a tunnel junction with that of a weak-link connecting a
conventional and unconventional superconductor. Selection rules for unconventional order parameters
which enforce zero supercurrent in a tunnel junction are not relevant for weak-links connecting the
same unconventional and conventional superconductor. We discuss the the a.c. Josephson effect for
several popular models of unconventional superconductivity relevant to the CuO and heavy fermion
superconductors.
- Comment:
2 pages, 1 figure
- Eprint:
[PDF]
Return to index