Morris, D. E. ; Narwankar, P. ; Sinha, A. P. B. ; Takano, K. ; Fayn, B. ; Shum, V. T. (1990) Calcium-substituted Y-Ba-Cu-O superconductors with enhanced Tc synthesized at elevated oxygen pressures Physical Review B: Condensed Matter and Materials Physics, 41 (7). pp. 4118-4122. ISSN 1098-0121
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Official URL: http://prb.aps.org/abstract/PRB/v41/i7/p4118_1
Related URL: http://dx.doi.org/10.1103/PhysRevB.41.4118
Abstract
Calcium substitution in the Y-Ba-Cu-O system at elevated P(O2) results in superconducting compounds with novel and enhanced properties: tetragonal CaxY(1-x)Ba2Cu3Oy with Tc=86 K for x=0.2 prepared at P(O2)=16 bars, and CaxY(1-x)Ba2Cu4Oy (1:2:4) with Tc=89 K for x=0.1 prepared at 50-200 bars. Calcium substitution shifts the phase-stability boundary between 1:2:3, 2:4:7, and 1:2:4 phases to higher P(O2), and stabilizes a tetragonal 1:2:3 structure at moderately elevated P(O2) without substantial decrease in Tc. The Tc of 1:2:4 increases with Ca substitution up to x=0.1, and then decreases gradually for larger x, possibly because of excessive hole concentration.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 48910 |
| Deposited On: | 18 Jul 2011 10:14 |
| Last Modified: | 18 Jul 2011 10:14 |
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