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Science 29 April 1988:
Vol. 240. no. 4852, pp. 631 - 634
DOI: 10.1126/science.240.4852.631
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Articles

Crystal Structure of Tl2Ba2Ca2Cu3O10, a 125 K Superconductor

C. C. TORARDI 1, M. A. SUBRAMANIAN 1, J. C. CALABRESE 1, J. GOPALAKRISHNAN 1, K. J. MORRISSEY 1, T. R. ASKEW 1, R. B. FLIPPEN 1, U. CHOWDHRY 1, and A. W. SLEIGHT 1

1 Central Research and Development Department, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, DE 19898.

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(sim125 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.

Submitted on March 30, 1988
Accepted on April 1, 1988


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