Liu, H. B. ; Morris, D. E. ; Sinha, A. P. B. ; Cao, X. W. ; Ho, J. C. (1992) Enhancement of Tc to 60 K in (Pb, Ca)Sr2(Ca, Y)Cu2O7-δ by high pressure oxygen treatment and quenching Physica C: Superconductivity, 197 (1-2). pp. 101-105. 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(92)90242-5
Abstract
(Pb, Ca)Sr2(Ca, Y)Cu2Oy which is a 1:2:1:2 compound with a (Pb, Ca)O mixed monolayer has been made superconducting by careful control of heating and annealing procedures at elevated oxygen pressure. There are two essential steps for getting the highest Tc (Tc>60K):(1) heating at 900-950° C under high P(O2) ~ 100 bar and (2) fast quenching to room temperature. In a sample so prepared the oxygen content has the stoichiometric value of 7.0, Pb is in the Pb4+ state and Tc=60 K. If the sample is slowly cooled under high oxygen pressure it picks up more oxygen, and this excess oxygen reduces Tc and finally destroys the superconductivity. This behavior is similar to that of the compound (Pb, Cu)Sr2(Ca, Y)Cu2Oy.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 48960 |
| Deposited On: | 19 Jul 2011 07:27 |
| Last Modified: | 19 Jul 2011 07:27 |
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