Confocal resonators for measuring the surface resistance of high-temperature superconducting films

Journal Article · Mon Jun 03 04:00:00 EDT 1991 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.104821· OSTI ID:5561210

Martens, J S; Hietala, V M; Ginley, D S; Zipperian, T E ^[1]; Hohenwarter, G K.G. ^[2]

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1. Sandia National Laboratories, Department 1140, Albuquerque, New Mexico 87185 (USA)
2. University of Wisconsin-Madison, ECE Department, Madison, Wisconsin 53706 (USA)

A quasioptical technique of measuring superconductor surface resistance using a confocal resonator has been developed. The method has advantages of nondestructive analysis, high sensitivity, easy extension to higher frequencies, convenient experimental setup, and flexibility in sample size. Tl-Ca-Ba-Cu-O high-temperature superconducting films have been measured with this technique and the measured surface resistances were less than 0.01 {Omega} at 36.135 GHz and 77 K. The measurements have been performed from 29 to 39 GHz, and all films showed roughly a quadratic dependence of surface resistance with frequency.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5561210
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 58:22; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
440600 -- Optical Instrumentation-- (1990-)
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CALCIUM OXIDES
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HIGH-TC SUPERCONDUCTORS
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