Singh, K. K. ; Morris, D. E. ; Sinha, A. P. B. (1994) Nd1+xBa2-xCu3Oy processed in high pressure oxygen. Effects of enhanced oxygen uptake on structure and superconductivity Physica C: Superconductivity, 224 (3-4). pp. 231-239. 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)90259-3
Abstract
The Tc of Nd1+xBa2-xCu3Oy (0.1≤ x≤ 0.6) has been increased by synthesizing and annealing the compounds in 200 bar oxygen pressure. The oxygen content, y, increases to compensate the effect of Nd3+ substitution and the formal average copper valence (FACV) remains unchanged at ~2.3 throughout the composition range. Although the FACV remains constant, Tc falls systematically with increasing x, suggesting that Nd3+ at the Ba2+ site binds a portion of holes. an increasingly negative slope of the weight-temperature plot with larger x, indicating that the enthalpy for binding the oxygen in the CuO chain increase when oxygen per formula unit increases beyond seven.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 48951 |
| Deposited On: | 19 Jul 2011 07:27 |
| Last Modified: | 19 Jul 2011 07:27 |
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