Journal ArticleDOI
100-K superconducting phases in the Tl-Ca-Ba-Cu-O system.
Robert M. Hazen,Larry W. Finger,Ross J. Angel,Charles T. Prewitt,Nancy L. Ross,C. G. Hadidiacos,Peter J. Heaney,David R. Veblen,Z.Z. Sheng,A. El Ali,Allen M. Hermann +10 more
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TLDR
Two superconducting phases, Tl-Ca-Ba-Cu-O system and 2122, both with onset T/sub c/ near 120 K and zero resistivity at 100 K, have been isolated from samples in the Tl/ sub 2/Ca/sub 1/Ba/sub 2/Cu/sub 3/O/sub 10/..mu../sub delta/ system.Abstract:
Two superconducting phases, ${\mathrm{Tl}}_{2}$${\mathrm{Ca}}_{2}$${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{10+\mathrm{\ensuremath{\delta}}}$ (2223) and ${\mathrm{Tl}}_{2}$${\mathrm{Ca}}_{1}$${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{2}$${)}_{8+\mathrm{\ensuremath{\delta}}}$ (2122), both with onset ${\mathrm{T}}_{\mathrm{c}}$ near 120 K and zero resistivity at 100 K, have been isolated from samples in the Tl-Ca-Ba-Cu-O system. The new 2223 superconductor has a 5.40\ifmmode\times\else\texttimes\fi{}5.40\ifmmode\times\else\texttimes\fi{}36.25-A${\mathrm{\r{}}}^{3}$ pseudotetragonal unit cell. The 2122 superconductor, which appears to be structurally related to ${\mathrm{Bi}}_{2}$${\mathrm{CaSr}}_{2}$${\mathrm{Cu}}_{2}$${\mathrm{O}}_{8+\mathrm{\ensuremath{\delta}}}$, has a 5.44\ifmmode\times\else\texttimes\fi{}5.44\ifmmode\times\else\texttimes\fi{}29.55-A${\mathrm{\r{}}}^{3}$ pseudotetragonal subcell. The 2223 phase is probably related to 2122 by the addition of extra calcium and copper layers.read more
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Book ChapterDOI
Bulk superconductivity at 125 K in Tl2Ca2Ba2Cu3Ox.
Stuart S. P. Parkin,V. Y. Lee,Edward M. Engler,A. I. Nazzal,T. C. Huang,G. Gorman,R. J. Savoy,Robert Beyers +7 more
TL;DR: In this paper, a trilayer Cu perovskitelike units separated by bilayer TI-O units were found in T12Ca2 Ba2 Cu3 Ox with a transition to zero resistance at ≃ 125 K.
Journal ArticleDOI
Crystal Structure of Tl2Ba2Ca2Cu3O10, a 125 K Superconductor
C. C. Torardi,Munirpallam A. Subramanian,Joseph C. Calabrese,Jagannatha Gopalakrishnan,K. J. Morrissey,T. R. Askew,R.B. Flippen,U. Chowdhry,Arthur W. Sleight +8 more
TL;DR: Electron microscopy in the Tl/Ba/Ca/Cu/O system has revealed intergrowths where n = 5; such regions may well be responsible for the superconducting onset behavior observed in this system at about 140 K.
Journal ArticleDOI
Crystal structures of high- T c oxides
Klaus Yvon,M. François +1 more
TL;DR: A comprehensive review of structure work on high-Tc oxides as reported during the years 1987 and 1988 is given in this paper, where 13 structures are refined from X-ray single-crystal and/or neutron powder diffraction data.
Journal ArticleDOI
A new high- T c TlBa 2 Ca 3 Cu 4 O 11 superconductor with T c >120K
H. Ihara,Ryoji Sugise,M. Hirabayashi,Norio Terada,M. Jo,K. Hayashi,A. Negishi,Madoka Tokumoto,Yoichi Kimura,T. Shimomura +9 more
TL;DR: In this paper, the authors report the synthesis and characterization of a new Tl-Ba-Ca-Cu-O superconductor which differs from these three in having only a single thallium layer (instead of two) per unit cell, but which has four CuO2 layers.
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