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

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

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)543-548
Number of pages6
JournalJournal of Low Temperature Physics
Issue number3-4
StatePublished - Nov 1 1993
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics


Dive into the research topics of 'Use of proximity effect in iridium-gold superconducting phase transition thermometers'. Together they form a unique fingerprint.

Cite this