NDLI: Thermally-induced nonlinearities in the surface impedance of superconducting YBCO thin films

Content Provider	IEEE Xplore Digital Library
Author	Wosik, J. Lei-Ming Xie Miller Jr., J.H. Long, S.A. Nesteruk, K.
Copyright Year	2002
Abstract	We have measured the microwave power dependence of the surface impedance Z/sub g/ of YBa/sub 2/Cu/sub 3/O/sub x/ (YBCO) thin films up to very high microwave power levels. Experiments have been performed, using both frequency and pulsed time domain techniques, in a 14 GHz TE/sub 011/ dielectric cavity. Our results demonstrate that heating of the superconducting film by the applied RF field contributes significantly to the nonlinearity of the measured surface resistance at high input power levels. Analysis of the electromagnetic response of the cavity to a pulsed input signal has been performed using a dielectric resonator model combined with appropriate thermal balance equations for the film-cavity system. Both the frequency- and time-dependent nonlinear electromagnetic responses of the cavity have been calculated as functions of input power, and are in excellent agreement with our data.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1470
Ending Page	1473
Page Count	4
File Size	445114
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Surface impedance Power measurement Electromagnetic heating Dielectric thin films Frequency Surface resistance Impedance measurement Microwave measurements Yttrium barium copper oxide Superconducting thin films
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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