Journal ArticleDOI
Bulk superconductivity at 120 K in the Tl-Ca/Ba-Cu-O system
Z.Z. Sheng,Allen M. Hermann +1 more
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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.Abstract:
The discovery of 30-K superconductivity in the La–Ba–Cu–O system1 and 90-K superconductivity in the Y–Ba–Cu–O system2 stimulated a worldwide search for even higher-temperature superconductors. Unfortunately, most of the higher-temperature transitions reported in the past year have proved to be unstable, irreproducible, or not due to bulk superconductivity3–7. Recently, we and co-workers8,9 reported superconductivity above 90 K in a new Tl–Ba–Cu–O system, and pointed out that elemental substitutions in this system may lead to even higher-temperature superconductivity. Here we report 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. This transition temperature is much higher than those observed for typical rare-earth-containing superconductors, and the onset temperatures are comparable to that in the Bi–Ca/Sr–Cu–O system, as reported in refs 10 and 11 (received after submission of this paper).read more
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Journal ArticleDOI
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.
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 structure of the high-temperature superconductor TI 2 Ba 2 CaCu 2 O 8
Munirpallam A. Subramanian,Joseph C. Calabrese,C. C. Torardi,Jagannatha Gopalakrishnan,T. R. Askew,R.B. Flippen,K. J. Morrissey,U. Chowdhry,Arthur W. Sleight +8 more
TL;DR: In this article, the authors presented X-ray diffraction data for a single crystal of the 2212 phase, which has an onset temperature of ∼112 K. The crystal structure, based on a body-centred tetragonal cell with a =3.8550(6) A and c = 29.318(4) A (space group I4/mmm), is essentially the same as that of Bi2Sr3-xCaxCu2O8 and comprises double copper-oxygen sheets alternating with double thallium-oxide layers.
Journal ArticleDOI
Models for the modulation in A2B2CanCu1+nO6+2n, A, B=Bi, Sr OR Tl, Ba and n=0, 1, 2
TL;DR: In this paper, a number of models for the modulation in the title compounds are postulated and the best agreement with experimental data is obtained for the model with extra oxygen in the BiO layers.
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 above 90 K in the square-planar compound system ABa2Cu3O6+x with A=Y, La, Nd, Sm, Eu, Gd, Ho, Er and Lu.
Pei-Herng Hor,R. L. Meng,Yongmei Wang,Li Gao,Z. J. Huang,J. Bechtold,K. Forster,Ching-Wu Chu +7 more
TL;DR: The results suggest that the unique square planar Cu atoms, each surrounded by four or six oxygen atoms, are crucial to the superconductivity of oxides in general.
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
Superconductivity at 155 K.
TL;DR: The accomplishment of high-tem temperature superconductivity is of immense scientific and technological importance and several critical transition-temperature barriers have recently been breached since the long-standing record temperature of 23.2 K for Nb3Ge was exceeded.