NDLI: Third-order local nonlinear microwave response of YBa/sub 2/Cu/sub 3/O/sub 7/ and Nb thin films

Content Provider	IEEE Xplore Digital Library
Author	Pestov, E.E. Nozdrin, Y.N. Kurin, V.V.
Copyright Year	2002
Abstract	HTS thin films continue to be of interest for passive device applications at microwave frequencies, but nonlinear effects may limit their performance. We report a set of experimental data on local third-harmonic generation at microwave frequencies (0.5 GHz) in YBa/sub 2/Cu/sub 3/O/sub 7/ and Nb thin films from 4.2 K to T/sub c/. For local investigations of the nonlinear response a probe with inductive coupling was developed. The map of the nonlinear microwave response of YBa/sub 2/Cu/sub 3/O/sub 7/ thin film is plotted below T/sub c/ with high resolution. The third-harmonic power is measured as a function of temperature, input power and dc-magnetic field on some places of the film. The temperature dependence demonstrates a peak of nonlinearity below T/sub c/ for YBa/sub 2/Cu/sub 3/O/sub 7/ and Nb films and a minimum of nonlinearity at low temperatures for HTS films. The behavior of the third-harmonic power vs the input power can be described by the power-law with the exponent n/spl sim/1.5-3. The correlation between the depinning current density J/sub p/ and the nonlinear microwave response is also demonstrated.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	131
Ending Page	134
Page Count	4
File Size	414073
File Format	PDF
ISSN	10518223
Volume Number	11
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	High temperature superconductors Microwave frequencies Niobium Transistors Temperature dependence Microwave devices Thin film devices Microwave generation Probes Couplings
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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