Crystal structure of Tl2Ba2Ca2Cu3O10, a 125 K superconductor

Torardi, C. C. ; Subramanian, M. A. ; Calabrese, J. C. ; Gopalakrishnan, J. ; Morrissey, K. J. ; Askew, T. R. ; Flippen, R. B. ; Chowdhry, U. ; Sleight, A. W. (1988) Crystal structure of Tl2Ba2Ca2Cu3O10, a 125 K superconductor Science, 240 (4852). pp. 631-634. ISSN 0036-8075

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There is now a new series of high-temperature superconductors that may be represented as (AIIIO)2A2IICan-1CunO2+2n where AIII is Bi or Tl, AII 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 AIII is Tl. This compound, Tl2Ba2Ca2Cu3O10, has the highest transition temperature( ~ 125 K) of any presently known bulk superconductor. The structure of Tl2Ba2Ca2Cu3O10 has been determined from single-crystal x-ray diffraction data and is tetragonal, with a = 3.85 Å and c = 35.9 Å. 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.

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ID Code:12210
Deposited On:10 Nov 2010 04:46
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