NDLI: Effects of non-uniform columnar defect distribution on the microwave properties of Y-Ba-Cu-O coplanar resonators

Content Provider	IEEE Xplore Digital Library
Author	Ghigo, G. Gozzelino, L. Laviano, F. Andreone, D. Mezzetti, E.
Copyright Year	2002
Abstract	This paper reports on nonuniform heavy ion irradiations of YBCO coplanar resonators aimed at controlling vortex-induced microwave dissipation and nonlinearity. The adopted moving-target irradiation technique allows producing tailored profiles of columnar defect density to get an optimal compromise between defect-induced enhancement of vortex pinning and addition of dissipative scattering. The same samples were characterized before and after irradiation in order to evaluate the surface impedance, by means of data analysis suitable to account also for the substrate properties. In the case of the modulated dose profile, matching the fundamental-mode field distribution along the resonator, the onset of nonlinearity is shifted toward higher circulating power, without increasing dissipation. Finally, the possibility to locally modify by irradiation the properties of the material to obtain the confinement of external perturbations, while maintaining the current continuity throughout the whole device, has been preliminarily tested.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3604
Ending Page	3607
Page Count	4
File Size	351519
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Yttrium barium copper oxide Superconducting microwave devices High temperature superconductors Superconducting films Scattering Superconducting devices Surface resistance Surface impedance Data analysis Superconducting materials superconducting microwave devices Coplanar waveguides high-temperature superconductors ion radiation effects
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Copper composition dependence of the structure and microwave properties in Y-Ba-Cu-O films

Anomalous features in surface impedance of Y-Ba-Cu-O thin films: dependence on frequency, RF and DC fields

Nonlinear surface impedance Z(T,f,H/sub rf/) of Tl-Ba-Ca-Cu-O thin films

Microwave cavity made from YBaCuO

Fundamental limits of the linear microwave power response of epitaxial Y-Ba-Cu-O films

Correlation between Cu deficiencies and changes in the structural and electrical properties of Y-Ba-Cu-O films

On-wafer measurements of nonlinear effects in high temperature superconductors

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A current-density scale for characterizing nonlinearity in high-T/sub c/ superconductors

Effects of non-uniform columnar defect distribution on the microwave properties of Y-Ba-Cu-O coplanar resonators

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