Critical current enhancement in NbN/AlN multilayers

J. M. Murduck*, D. W. Capone, Ivan K. Schuller, S. Foner, John B Ketterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


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 languageEnglish (US)
Pages (from-to)504-506
Number of pages3
JournalApplied Physics Letters
Issue number6
StatePublished - 1988

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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