High-temperature superconducting Josephson mixers from deliberate grain boundaries in Tl2CaBa2Cu2O8

Lincoln C. Bourne; A. H. Cardona; Tim W. James; J. S. Fleming; Roger J. Forse; Robert B. Hammond; J. P. Hong; T. W. Kim; Harold R. Fetterman

doi:10.1117/12.45610

1 July 1991 High-temperature superconducting Josephson mixers from deliberate grain boundaries in Tl2CaBa2Cu2O8

Lincoln C. Bourne, A. H. Cardona, Tim W. James, J. S. Fleming, Roger J. Forse, Robert B. Hammond, J. P. Hong, T. W. Kim, Harold R. Fetterman

Author Affiliations +

Proceedings Volume 1477, Superconductivity Applications for Infrared and Microwave Devices II; (1991) https://doi.org/10.1117/12.45610
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

Deliberate grain boundaries have been fabricated in epitaxial films of Tl2CaBa2Cu2O8 by growing the films on substrates with localized surface damage and on substrates with surface steps produced with an anisotropic etching process. Bowtie antennas were fabricated to couple millimeter wave radiation into the weak link junctions, which were used as the nonlinear elements. Heterodyne mixing of signals at 55 GHz and 94 GHz was observed in the integrated antenna/detector structures at temperatures below 101 K in the Tl-based films. In addition, observations were made at 55 GHz, using these structures as subharmonic mixers. We have designed an integrated microwave package to measure the noise and conversion efficiency of the grain-boundary junctions at frequencies between 9 GHz and 20 GHz.

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Lincoln C. Bourne, A. H. Cardona, Tim W. James, J. S. Fleming, Roger J. Forse, Robert B. Hammond, J. P. Hong, T. W. Kim, and Harold R. Fetterman "High-temperature superconducting Josephson mixers from deliberate grain boundaries in Tl2CaBa2Cu2O8", Proc. SPIE 1477, Superconductivity Applications for Infrared and Microwave Devices II, (1 July 1991); https://doi.org/10.1117/12.45610

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