Use of proximity effect in iridium-gold superconducting phase transition thermometers


Journal Article

We have studied the proximity effect in bilayers of thin films of iridium covered by gold. These structures were evaporated onto sapphire single crystals for use as phase transition thermometers in cryogenic particle detectors. By varying the thicknesses of the iridium and gold layers, we achieved critical temperatures as low as 33 mK. The critical temperature of the bilayers is lower than predicted by the theory of de Gennes-Werthamer, but adding a free parameter to the theory allows good agreement. The transitions of the bilayers typically had widths of a few mK, with the narrowest reaching 0.2 mK, and were always sharper than those of pure iridium films evaporated simultaneously. © 1993 Plenum Publishing Corporation.

Full Text

Cited Authors

  • Nagel, U; Nowak, A; Kellner, E; Gebauer, HJ; Colling, P; Cooper, S; Dummer, D; Ferger, P; Frank, M; Freund, P; Forster, G; Igalson, J; Nucciotti, A; Pröbst, F; Rulofs, A; Seidel, W; Stodolsky, L

Published Date

  • November 1, 1993

Published In

Volume / Issue

  • 93 / 3-4

Start / End Page

  • 543 - 548

Electronic International Standard Serial Number (EISSN)

  • 1573-7357

International Standard Serial Number (ISSN)

  • 0022-2291

Digital Object Identifier (DOI)

  • 10.1007/BF00693473

Citation Source

  • Scopus