NDLI: Time constant measurements and effective permeability of a stack of high-T/sub c/ tapes

Content Provider	IEEE Xplore Digital Library
Author	Eckelmann, H. Krempasky, L. Schmidt, C.
Copyright Year	2002
Abstract	Filament cross-sections of high-T/sub c/ tapes have generally a large aspect ratio. The magnetic moment of the filaments which determines the magnetic properties of a stack of tapes therefore depends strongly on the magnetic field orientation. The stack can be treated as a material with an effective permeability /spl nu//sub ef/. For large field amplitudes /spl mu//sub ef/ approaches unity, while for low amplitudes it can be considerably smaller than unity, namely in the case of perpendicular external field. We derived expressions for /spl mu//sub ef/ for parallel and perpendicular field amplitudes well below the filament penetration field. Under this assumption the filaments are supposed to be perfectly diamagnetic. The theoretical predictions for /spl mu//sub ef/ are compared with the values extracted from direct time constant measurements. The experiments were performed with samples stacks of twisted and untwisted Bi-2223 tapes. The effective transverse matrix resistivity was found to be highly anisotropic which is understood as the presence of a boundary layer resistance between the filaments and the silver matrix.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2768
Ending Page	2771
Page Count	4
File Size	428077
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	Permeability measurement Time measurement Magnetic field measurement Magnetic moments Magnetic properties Magnetic materials Electrical resistance measurement Conductivity Anisotropic magnetoresistance Silver
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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