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.
Original language | English (US) |
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Pages (from-to) | 504-506 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 52 |
Issue number | 6 |
DOIs | |
State | Published - Dec 1 1988 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)