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Proceedings Paper

Thin film processing and device fabrication in the Tl-Ca-Ba-Cu-O system
Author(s): Jon S. Martens; David S. Ginley; Thomas E. Zipperian; Vincent M. Hietala; Chris P. Tigges
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Paper Abstract

TlCaBaCuO films using e-beam evaporation with subsequent sintering and annealing that have critical current densities of at least several hundred kA/sq cm, critical temperatures over 100 K, and surface resistance better than that of gold at 77 K and 8 GHz. Processing techniques have been developed for making microwave passive elements and a four-terminal active device called the superconducting flux flow transistor (SFFT) for microwave applications. The techniques include contacting, dielectric, normal layer deposition, and controlled HTS film etching. The SFFT shows promise as a microwave amplifier, oscillator, and active impedance converter and may also have many other applications. The advantages of the device include high speed, potentially low noise, and, for some applications, useful impedance levels.

Paper Details

Date Published: 1 March 1991
PDF: 10 pages
Proc. SPIE 1394, Progress In High-Temperature Superconducting Transistors and Other Devices, (1 March 1991); doi: 10.1117/12.25740
Show Author Affiliations
Jon S. Martens, Sandia National Labs. (United States)
David S. Ginley, Sandia National Labs. (United States)
Thomas E. Zipperian, Sandia National Labs. (United States)
Vincent M. Hietala, Sandia National Labs. (United States)
Chris P. Tigges, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 1394:
Progress In High-Temperature Superconducting Transistors and Other Devices
Rajendra Singh; Jagdish Narayan; David T. Shaw, Editor(s)

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