TITLE

Critical current enhancement in NbN/AlN multilayers

AUTHOR(S)
Murduck, J. M.; Capone, D. W.; Schuller, Ivan K.; Foner, S.; Ketterson, J. B.
PUB. DATE
February 1988
SOURCE
Applied Physics Letters;2/8/1988, Vol. 52 Issue 6, p504
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Measurements are presented of the critical current density, Jc, and parallel upper critical field, Hc2||, for the refractory superconductor/insulator multilayer system NbN/AlN. A dramatic increase in Jc, together with an increase of Hc2||, is observed with decreasing NbN layer thickness. The Jc enhancement arises from flux pinning in the AlN or at the NbN-AlN interface, not at defects in the NbN structure. The results indicate that the development of superconductor/insulator composites is a viable strategy to increase the critical current. Thermal stabilization which does not degrade the very high Jc values was also accomplished in a novel structure by addition of copper layers within the superlattice.
ACCESSION #
9825887

 

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