NDLI: Resistivity and critical current anisotropy of untwinned a-axis YBCO thin films

Content Provider	IEEE Xplore Digital Library
Author	Trajanovic, Z. Takeuchi, I. Lobb, C.J. Venkatesan, T. Warburton, P.A.
Copyright Year	2002
Abstract	We have pulsed laser deposited untwinned a-axis oriented YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// films on (100) LaSrGaO/sub 4/. From resistive measurements, the chain contribution to the total charge carrier density was estimated to be around 60%. Critical current density (J/sub c/) depends on the granular nature of the films and the transport across each grain boundary can be modeled as a collection of multiple parallel narrow conductive paths. Measurements in fields up to 6 T indicate that the behavior of J/sub c/ vs. B along the b- and c- directions is similar to that of standard c-axis films, with no significant weak link effects from the grain boundaries. We have also measured the temperature and magnetic field dependence of the critical current density (J/sub c/) along b- and c- directions of our films. The direction of magnetic field with respect to the crystallographic axes was found to be the dominant factor determining the J/sub c/. For supercurrents flowing along the c- direction, a cross-over from grain boundary pinning to surface and interface pinning was observed as temperatures approached T/sub c/.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1636
Ending Page	1641
Page Count	6
File Size	655487
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	Conductivity Critical current Anisotropic magnetoresistance Magnetic field measurement Grain boundaries Pulsed laser deposition Density measurement Current measurement Critical current density Magnetic films
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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