Journal ArticleDOI
Superconductivity in the Bi-Sr-Ca-Cu-O compounds with noble metal additions
TLDR
In this article, the resistivity and magnetic susceptibility measurements on sintered Bi4Sr3Ca2Cu4O16+x containing 20% by weight of Au, Ag, or Pt-group metals indicate that Au and the Ptgroup metals significantly suppress or eliminate the superconducting transition in BiSr•Ca•Cu•O.Abstract:
The Bi‐Sr‐Ca‐Cu‐O superconductors have been doped with various noble metals and their superconducting properties have been investigated. The resistivity and magnetic susceptibility measurements on sintered Bi4Sr3Ca2Cu4O16+x containing 20% by weight of Au, Ag, or Pt‐group metals indicate that Au and the Pt‐group metals significantly suppress or eliminate the superconducting transition in Bi‐Sr‐Ca‐Cu‐O. Only Ag is found to be benign, maintaining both the 115 and 85 K transitions in the compound. This nonpoisoning behavior of silver is of significant technical importance because of the need for a proper stabilizing normal metal for composite superconductor wire, nonreactive crucible materials for melt processing or crystal growth, and suitable nonpoisonous substrates or barriers for thin‐ or thick‐film superconducting devices.read more
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Melt-processed light rare earth element - Ba - Cu - O
TL;DR: In this article, the microstructural and superconducting properties of light rare earth elements (LREs) are reviewed and the flux pinning mechanism is also discussed, on the basis of their study over the last several years, the melt processes for LRE - Ba - Cu - O are described.
Journal ArticleDOI
Magneto-optical studies of current distributions in high-Tc superconductors
TL;DR: In this paper, a review of the magneto-optical imaging technique and experiments on thin films, single crystals, polycrystalline bulk ceramics, tapes and melt-textured HTS materials is presented.
Journal ArticleDOI
Processing of bulk YBaCuO
TL;DR: In this article, the authors summarized processing of bulk YBa2Cu3Ox superconductors with an emphasis placed on the relationship between microstructure and critical currents, and some possible applications of melt processed superconductor in bulk form are also introduced.
Journal ArticleDOI
Flux pinning in melt-grown NdBa2Cu3Oy and SmBa2Cu3Oy superconductors
Masato Murakami,Sang-Im Yoo,Takamitsu Higuchi,Naomichi Sakai,Jurgen Weltz,Naoki Koshizuka,Shoji Tanaka +6 more
TL;DR: In this paper, the authors showed that rare earth (RE) ions with large radii exhibit relatively low T c due to the presence of RE-Ba solid solution and that this solid solution can be suppressed if these superconductors are melt processed in a reduced oxygen atmosphere.
Journal ArticleDOI
Progress in melt texturing of YBa2Cu3Ox superconductor
TL;DR: In this article, high-temperature mechanical deformation has been shown to increase dislocation density and results in improved Jc as well as reduced Jc anisotropy.
References
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Journal ArticleDOI
Possible high Tc superconductivity in the Ba-La-Cu-O system
TL;DR: In this paper, Ba−La−Cu−O system, with the composition BaxLa5−xCu5O5(3−y) have been prepared in polycrystalline form, and samples with x=1 and 0.75,y>0, annealed below 900°C under reducing conditions, consist of three phases, one of them a perovskite-like mixed-valent copper compound.
Journal ArticleDOI
Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure
Maw-Kuen Wu,J. R. Ashburn,C. J. Torng,Pei-Herng Hor,R. L. Meng,Li Gao,Z. J. Huang,Yongmei Wang,Ching-Wu Chu +8 more
TL;DR: A stable and reproducible superconductivity transition between 80 and 93 K has been unambiguously observed both resistively and magnetically in a new Y-Ba-Cu-O compound system at ambient pressure.
Journal ArticleDOI
Superconductivity in the high-Tc Bi-Ca-Sr-Cu-O system - Phase identification
Robert M. Hazen,Robert M. Hazen,Robert M. Hazen,C. T. Prewitt,C. T. Prewitt,C. T. Prewitt,R. J. Angel,R. J. Angel,R. J. Angel,N. L. Ross,N. L. Ross,N. L. Ross,L. W. Finger,L. W. Finger,L. W. Finger,C. G. Hadidiacos,C. G. Hadidiacos,C. G. Hadidiacos,David R. Veblen,David R. Veblen,David R. Veblen,Peter J. Heaney,Peter J. Heaney,Peter J. Heaney,P. H. Hor,P. H. Hor,P. H. Hor,R. L. Meng,R. L. Meng,R. L. Meng,Y. Y. Sun,Y. Y. Sun,Y. Y. Sun,Yumo Wang,Yumo Wang,Yumo Wang,Y. Y. Xue,Y. Y. Xue,Y. Y. Xue,Z. J. Huang,Z. J. Huang,Z. J. Huang,L. Gao,L. Gao,L. Gao,J. Bechtold,J. Bechtold,J. Bechtold,C. W. Chu,C. W. Chu,C. W. Chu +50 more
TL;DR: X-ray diffraction and electron microscopy data are consistent with a structure of alternating perovskite and Bi-Ca-Sr-Cu-O layers, which reveals a b-axis superstructure of 27.2 A, numerous stacking faults, and other defects.
Journal ArticleDOI
High TC superconductors—composite wire fabrication
TL;DR: In this paper, the authors report preliminary success in the fabrication of fine-wire, composite superconductors consisting of a high-conductivity normal metal shell such as Ag or Cu/Ni/Au and a superconducting core of Ba2YCu3O7 oxide.