NDLI: Effect of Mg doping on the superconducting properties of Cu/sub 1-x/Tl/sub x/Ba/sub 2/Ca/sub 3-y/Mg/sub y/Cu/sub 4/O/sub 12-/spl delta//

Content Provider	IEEE Xplore Digital Library
Author	Khan, N.A. Nawaz, S.
Copyright Year	2002
Abstract	Superconducting properties of Cu_1-xTl_xBa₂Ca_3-yMg_yCu₄O_12-delta (Cu_1-xTl_xMg_y-1234) material have been studied in the composition range y=0,1.5,2.25. The zero resistivity critical temperature [T_c(R=0)] was found to increase with the increased concentration of Mg in the unit cell; for y=1.5 [T_c(R=0)]=131 K was achieved which is hitherto highest in Cu_1-xTl_x-based superconductors. The X-ray diffraction analyses have shown the formation of a predominant single phase of Cu_0.5Tl_0.5Ba₂Ca_3-yMg_yCu₄O_12-delta superconductor with an inclusion of impurity phase. It is observed from the convex shape of the resistivity versus temperature measurements that our as-prepared material was in the region of carrier over-doping, and the number of carriers was optimized by postannealing experiments in air at 400degC, 500degC, and 600degC. The T_c(R=0) was found to increase with postannealing and the best postannealing temperature was found to be 600degC. The mechanism of increased T_c(R=0) is understood by carrying out infrared absorption measurements. It was observed through softening of Cu(2)-O_A-Tl apical oxygen mode that improved interplane coupling was a possible source of enhancement of T_c(R=0) to 131 K
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2
Ending Page	8
Page Count	7
File Size	447559
File Format	PDF
ISSN	10518223
Volume Number	16
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Doping Superconducting materials Conductivity Superconductivity Composite materials X-ray diffraction Impurities Shape measurement Temperature measurement Electromagnetic wave absorption normal pressure synthesis Cu improved interplane couplings Mg doping
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Effect of Mg doping on the superconducting properties of Cu/sub 1-x/Tl/sub x/Ba/sub 2/Ca/sub 3-y/Mg/sub y/Cu/sub 4/O/sub 12-/spl delta//

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