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Proceedings Paper

High-Tc superconductor tunnel junctions for photon detectors
Author(s): John Zasadzinski; Jun Chen; Kenneth E. Gray; David G. Hinks
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Paper Abstract

SIN and SIS quasiparticle tunnel junctions on high TC superconductors (HTS) offer the possibility of low-noise, heterodyne, photon detection in the THz regime. We report progress on the development of such junctions using mechanical point contacts. In general, these contacts display the optimum characteristics that can be obtained from HTS native-surface tunnel barriers. The bismuthate, Ba1-xKxBiO3, (TC equals 25 K) displays ideal, BCS, quasiparticle characteristics at T equals 4.2 K however, at temperatures T approximately equals TC/2 there is evidence of strong quasiparticle damping which may inhibit device performance. The cuprates typically display non-ideal quasiparticle characteristics including large sub-gap conductances. Recent data for the new Hg-based cuprates (TC equals 96 K) are promising in that they exhibit very low and flat sub-gap conductances as expected from a BCS density of states. Proximity effect tunnel junctions on Bi2Sr2CaCu2O8/Au bilayers have been studied using an In tip. An induced energy gap has been consistently observed in the Au layer and the data can be understood using the McMillan model. A few junctions show much improved sub- gap characteristics compared to ones made directly on the BSCCO surface and indicate that this approach may be suitable for mixer development.

Paper Details

Date Published: 19 August 1994
PDF: 8 pages
Proc. SPIE 2211, Millimeter and Submillimeter Waves, (19 August 1994);
Show Author Affiliations
John Zasadzinski, Illinois Institute of Technology (United States)
Jun Chen, Argonne National Lab. (United States)
Kenneth E. Gray, Argonne National Lab. (United States)
David G. Hinks, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 2211:
Millimeter and Submillimeter Waves
Mohammed N. Afsar, Editor(s)

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