Search for a proximity effect induced gap in gold/high Tc junctions


Journal Article

We have used high-resolution photoemission spectroscopy to search for a proximity effect induced superconducting gap in gold overlayers on c-axis single crystals of Bi2Sr2CaCu2O8 and a-axis thin films of YBa2Cu3O7. These two junction types give us a representative sampling of very well characterized near-ideal interfaces (gold/c-axis Bi2Sr2CaCu 2O8) and junctions in which the geometry more strongly favors the existence of the proximity effect but the interfacial quality may not be as ideal (gold/a-axis YBa2Cu3O7). In neither of these junction types did we observe any evidence for a proximity effect induced gap, and we place an upper limit of approximately 5 meV on its existence in the junctions that we have studied.

Full Text

Duke Authors

Cited Authors

  • Dessau, DS; Wells, BO; Shen, ZX; Spicer, WE; Arko, AJ; List, RS; Olson, CG; Eom, CB; Mitzi, DB; Kapitulnik, A; Geballe, TH

Published Date

  • December 1, 1991

Published In

Volume / Issue

  • 58 / 12

Start / End Page

  • 1332 - 1334

International Standard Serial Number (ISSN)

  • 0003-6951

Digital Object Identifier (DOI)

  • 10.1063/1.104301

Citation Source

  • Scopus