New oxide superconductors

Subramanian, M. A. ; Torardi, C. C. ; Gopalakrishnan, J. ; Calabrese, J. C. ; Morrissey, K. J. ; Askew, T. R. ; Flippen, R. B. ; Chowdhry, U. ; Sleight, A. W. ; Lin, J. J. ; Poon, S. J. (1988) New oxide superconductors Physica C: Superconductivity, 153-155 . pp. 608-612. ISSN 0921-4534

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Crystals of the new high temperature superconductor Bi2Sr3-xCaxCu2O8+y have been grown and studied. Single crystal x-ray diffraction data were used to determine a pseudo tetragonal structure based on an A-centered orthorhombic cell with a = 5.399Å,b= 5.414Å,and c= 30.904Å. The structure contains the copper-oxygen sheets as in La2CuO4 and YBa2Cu3O7, but the copper-oxygen chains present in YBa2Cu3O7 do not occur in Bi2Sr3-xCaxCu2O8+y. Electrical measurements on our single crystals show a resistivity drop at about 116 K and apparent zero resistivity at 91 K. We find superconductivity at 120 K in the Tl/Ca/Ba/Cu/O system. Also, we have for the first time prepared phases of the type La2-xNaxCuO4. These materials are superconducting with Tc's as high as 40 K, and they have some unusual magnetic behavior starting at about 10 K.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:12305
Deposited On:10 Nov 2010 06:32
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