Liu, H. B. ; Morris, D. E. ; Sinha, A. P. B. ; Kwei, George H. (1994) Effect of praseodymium substitution in YBa2Cu4O8 (1:2:4) Physica C: Superconductivity, 223 (1-2). pp. 51-56. 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(94)90693-9
Abstract
Pr substituted YBa2Cu4O8 (1:2:4) has been synthesized by a solid-state reaction at 930° C-950° C in 200 bar oxygen pressure. Pr could be substituted only up to 20% i.e., Y0.8Pr0.2Ba2Cu4O8. Tc decreased with increasing Pr; however, Tc could be restored by co-substitution of Ca along with Pr which was possible up to Pr=0.2 and Ca=0.1. XANES indicated the presence of Pr3+ but not Pr3+. In 1:2:4, Tc depends on the rare-earth ion size, and Pr3+ ions cause only a small additional suppression of Tc below that expected from the size of Pr3+. The large "Pr effect" in the suppression of Tc of 1:2:3 is thus a special property of the 1:2:3 structure.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 48972 |
| Deposited On: | 19 Jul 2011 07:27 |
| Last Modified: | 19 Jul 2011 07:27 |
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