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

doi:10.1007/BF00693473

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 journal › Article › peer-review

9 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	543-548
Number of pages	6
Journal	Journal of Low Temperature Physics
Volume	93
Issue number	3-4
DOIs	https://doi.org/10.1007/BF00693473
State	Published - Nov 1 1993
Externally published	Yes

ASJC Scopus subject areas

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

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Nagel, U., Nowak, A., Kellner, E., Gebauer, H. J., 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. (1993). Use of proximity effect in iridium-gold superconducting phase transition thermometers. Journal of Low Temperature Physics, 93(3-4), 543-548. https://doi.org/10.1007/BF00693473

Use of proximity effect in iridium-gold superconducting phase transition thermometers. / Nagel, U.; Nowak, A.; Kellner, E.; Gebauer, H. J.; Colling, P.; Cooper, S.; Dummer, D.; Ferger, P.; Frank, Matthias; Freund, P.; Forster, G.; Igalson, J.; Nucciotti, A.; Pröbst, F.; Rulofs, A.; Seidel, W.; Stodolsky, L.

In: Journal of Low Temperature Physics, Vol. 93, No. 3-4, 01.11.1993, p. 543-548.

Research output: Contribution to journal › Article › peer-review

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 1993, 'Use of proximity effect in iridium-gold superconducting phase transition thermometers', Journal of Low Temperature Physics, vol. 93, no. 3-4, pp. 543-548. https://doi.org/10.1007/BF00693473

Nagel, U. ; Nowak, A. ; Kellner, E. ; Gebauer, H. J. ; Colling, P. ; Cooper, S. ; Dummer, D. ; Ferger, P. ; Frank, Matthias ; Freund, P. ; Forster, G. ; Igalson, J. ; Nucciotti, A. ; Pröbst, F. ; Rulofs, A. ; Seidel, W. ; Stodolsky, L. / Use of proximity effect in iridium-gold superconducting phase transition thermometers. In: Journal of Low Temperature Physics. 1993 ; Vol. 93, No. 3-4. pp. 543-548.

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abstract = "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.",

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AU - Nagel, U.

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AU - Gebauer, H. J.

AU - Colling, P.

AU - Cooper, S.

AU - Dummer, D.

AU - Ferger, P.

AU - Frank, Matthias

AU - Freund, P.

AU - Forster, G.

AU - Igalson, J.

AU - Nucciotti, A.

AU - Pröbst, F.

AU - Rulofs, A.

AU - Seidel, W.

AU - Stodolsky, L.

PY - 1993/11/1

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N2 - 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.

AB - 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.

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

Abstract

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