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
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TLDR
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.Abstract:
There is now a new series of high-temperature superconductors that may be represented as (A(III)O)(2)A(2)(II)Can-1CunO2+2n where A(III) is Bi or Tl, A(II) is Ba or Sr, and n is the number of Cu-O sheets stacked consecutively. There is a general trend toward higher transition temperatures as n increases. The highest n value for a bulk phase is three and is found when A(III) is Tl. This compound, Tl(2)Ba(2)Ca(2)Cu(3)O(10), has the highest transition temperature( approximately 125 K) of any presently known bulk superconductor. The structure of Tl(2)Ba(2)Ca(2)Cu(3)O(10) has been determined from single-crystal x-ray diffraction data and is tetragonal, with a = 3.85 A and c = 35.9 A. No superstructure is observed, and the material is essentially twin-free. 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.read more
Citations
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Journal ArticleDOI
Mechanisms for hole doping in thallium cuprate superconductors having single copper-oxygen sheets
TL;DR: In this article, the effect of chemical substitution on the superconducting properties of thallium cuprates containing single Cu-O sheets interleaved with single and double Tl-O layers was investigated.
Journal ArticleDOI
Superconductivity in the BiSrMgCuO system
Werner Urland,Frank Tietz +1 more
TL;DR: A superconducting transition with an onset temperature near 6 {Kappa} was observed for Bi/sub 2.04/Sr/sub 1.76/Mg/sub 0.30/Cu/sub 6.20/ which crystallizes in the Bi/Sub 2.
Book ChapterDOI
Grain connectivity and vortex pinning in high-temperature superconductors
TL;DR: In this article, a detailed overview of the properties of the grain boundaries and their effects on grain-boundary J c, which is the current density producing an arbitrarily defined electric field on the superconductor, is presented.
Journal ArticleDOI
Identification of superconducting phases in a new structural series TlBa2Can-1CunO2n+(3-x) by transmission electron microscopy
TL;DR: In this paper, two phases have been identified in the multiphase compounds of TlBaCaCuOx with a superconducting temperature of 72.5 K. Both phases are weakly modulated incommensurately in the (100) and (010) directions.
Journal ArticleDOI
Effect of vanadium substitution on the microstructural and superconducting properties of Tl2Ba2Ca2−xVxCu3Oy superconductors
TL;DR: In this article, the effects of vanadium substitution for Ca sites on the Tl-2223 superconductor have been studied, and the obtained samples have been characterized by x-ray diffraction, scanning electron microscope and the superconductivity of these samples has been investigated by electrical resistivity.
References
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Journal ArticleDOI
A New High-TcOxide Superconductor without a Rare Earth Element
TL;DR: In this paper, a new high-Tc oxide superconductor of the BiSrCa-Cu-O system without any rare earth element was discovered, which has Tc of about 105 K, higher than that of YBa2Cu3O7 by more than 10 K.
Journal ArticleDOI
Bulk superconductivity at 120 K in the Tl-Ca/Ba-Cu-O system
Z.Z. Sheng,Allen M. Hermann +1 more
TL;DR: In this paper, stable and reproducible bulk superconductivity with an onset at 120 K and zero resistance above 100 K in the Tl-Ca/Ba-Cu-O system was reported.
Journal ArticleDOI
Structural and physical properties of the metal (M) substituted YBa2Cu3-xMxO7-y perovskite.
Jean-Marie Tarascon,P. Barboux,P. F. Miceli,Laura Greene,G. W. Hull,M. Eibschütz,Steven A. Sunshine +6 more
TL;DR: In this paper, the origin of the orthorhombic-tetragonal transition and the importance of the Cu-O chains for superconductivity is discussed. But the behavior of these materials with respect to magnetic impurities is apparently different from conventional Bardeen-Cooper-Schrieffer-type superconductors, and any new mechanism proposed must be mostly sensitive to local structural disorder.
Journal ArticleDOI
Superconductivity in the rare-earth-free Tl–Ba–Cu–O system above liquid-nitrogen temperature
Z.Z. Sheng,Allen M. Hermann +1 more
TL;DR: In this paper, the authors reported superconductivity in the rare earth-free TI-Ba-Cu-O system with a resistance starting at 90 K with zero resistance at 81 K.
Journal ArticleDOI
A New High-Temperature Superconductor: Bi2Sr3-x Cax Cu2O8+y.
Munirpallam A. Subramanian,C. C. Torardi,Joseph C. Calabrese,Jagannatha Gopalakrishnan,K. J. Morrissey,T. R. Askew,R.B. Flippen,U. Chowdhry,Arthur W. Sleight +8 more
TL;DR: A new superconductor that displays onset behavior near 120 K has been identified as Bi2Sr3-xCaxCu2O8+y, with x ranging from about 0.4 to 0.9, and electron microscopy studies show an incommensurate superstructure along the a axis that can be approximated by an increase of a factor of 5 over the subcell dimension.
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