NDLI: The effect of Gd doping on the critical current of the Chevrel phase superconductor PbMo/sub 6/S/sub 8/

Content Provider	IEEE Xplore Digital Library
Author	Zheng, D.N. Hampshire, D.P.
Copyright Year	2002
Abstract	A series of samples of Chevrel phase superconductor with nominal composition Pb/sub 1-x/Gd/sub x/Mo/sub 6/S/sub 8/ (0/spl les//spl times//spl les/0.04) have been made using a hot isostatic pressing (HIP) process. DC magnetic measurements have been carried out on the samples. A small increase followed by a decrease of J/sub c/ is observed by increasing the Gd content. The irreversibility field B/sub irr/ also exhibits a similar change. However, despite the change in J/sub c/ and the irreversibility line it was found that the pinning force curves for all samples follow the Kramer scaling relation F/sub p/=J/sub c/,/spl times/B/spl prop/b/sup 1/2/(1-b)/sup 2/ over a wide temperature range. This striking feature indicates that J/sub c/ is limited by one dominant flux pinning mechanism in these samples. A grain boundary pinning mechanism has been proposed previously to account for the scaling relation. In order to test this suggestion further, measurements have been carried out on powdered samples which consist of few grain boundaries. Magneto-resistivity and ac susceptibility measurements have been performed on the samples to investigate the change of B/sub c2/ and other parameters in the Gd doped samples.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1755
Ending Page	1758
Page Count	4
File Size	427613
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	Doping Critical current Grain boundaries Pressing Hip Magnetic variables measurement Temperature distribution Flux pinning Testing Magnetic flux
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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