NDLI: Determination of the Critical Current Density in <inline-formula> <tex-math notation=TeX>$hbox{YBa}_{2}hbox{Cu}_{3}hbox{O}_{7-delta}$</tex-math></inline-formula> Thin Films Measured by the Screening Technique Under Two Criteria

Content Provider	IEEE Xplore Digital Library
Author	Gamboa, F. Perez, I. Matutes-Aquino, J.A. Moewes, A. Sosa, V.
Copyright Year	2002
Abstract	We report the determination of critical current density J_c flowing in YBa₂Cu₃O_7-δ superconducting thin films by two independent criteria. The estimation of J_c was carried out by an inductive technique, i.e., the so-called screening technique. Both the imaginary part of the fundamental harmonic of susceptibility χ₁" and the third harmonic of the voltage V₃ criteria were used to determine the full penetration field. Our goal is to shed light on the selection of the criterion for the determination of J_c. In order to compare the inductive criteria, we investigated the homogeneity of J_c via transport measurements conducted on microbridges patterned in the films. Based on the transport method, we found that, for temperatures close to critical temperature T_c, both techniques yield similar results in the determination of J_c. However, at temperatures relatively far from T_c, the V₃ criterion showed better agreement with the transport data. Furthermore, using both criteria, we propose an alternative methodology to estimate in situ the coil factor associated with the V₃ criterion, avoiding in this way the need for implementing an additional technique.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1
Ending Page	5
Page Count	5
File Size	827404
File Format	PDF
ISSN	10518223
Volume Number	25
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Temperature measurement Superconducting magnets Magnetic resonance imaging Current measurement Harmonic analysis Temperature dependence coil factor Critical current density ac magnetic susceptibility screening technique Alternating current (ac) magnetic susceptibility critical current density
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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