Liu, H. B. ; Morris, D. E. ; Sinha, A. P. B. (1993) (Mg,Pb)Sr2(Y,Ca)Cu2O7, a new 60 K superconductor in the Pb-1:2:1:2 family Physica C: Superconductivity, 204 (3-4). pp. 262-266. ISSN 0921-4534
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Official URL: http://www.sciencedirect.com/science/article/pii/0...
Related URL: http://dx.doi.org/10.1016/0921-4534(93)91007-I
Abstract
(Mg,Pb)Sr2(Y,Ca)Cu2O7, a new superconductor in the Pb-1:2:1:2 family, has been synthesized. The Y:Ca ratio and annealing conditions (oxygen pressure/temperature) have been optimized. Addition of silver oxide aids in increasing the superconducting volume fraction and raising Tc to 60 K. Since this Tc is comparable to that of other Pb-1:2:1:2 compounds, it is unlikely that Mg2+ replaces Cu in the CuO2 planes, in spite of its small radius (r=0.72 Å ); in that case a substantial depression of Tc would be expected. Instead, Mg2+ appears to go into the PbO layer in a rock-salt surrounding, in analogy with other divalent elements.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 48927 |
| Deposited On: | 19 Jul 2011 07:27 |
| Last Modified: | 19 Jul 2011 07:27 |
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