Phase formation and lattice strain in superconducting compound Y1−xLaxBa2Cu3Oy (0<~x<~1)
A. Gantis, M. Calamiotou, D. Palles, D. Lampakis, E. Liarokapis
DOI 10.1103/PhysRevB.68.064502 · Physical Review B
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Abstract
We study the formation and evolution of phases in the La substituted Y1−xLaxBa2Cu3Oy [(Y–La)123] superconductors from XRD and Raman measurements. We find characteristic modifications in the interatomic distances, bond valence sum (BVS) values and crystallite microstrains, which correlate with corresponding features of the micro-Raman spectra at nominal La compositions x=0.2, 0.5, and 0.8. Based on the Raman spectra we conclude that two phases appear, an intermediate of chemical formula Y1−xLaxBa2Cu3Oy with x values less than nominal, and another phase of pure La123 with partial substitution of La for Ba and reduced Tc. The crystallographic changes and the reduction of Tc can be interpreted based on the formation of this pure La123 subphase upon La doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y0.99La0.01Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure unresolved | onset |
| Y0.9La0.1Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure unresolved | onset |
| Y0.8La0.2Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure unresolved | onset |
| Y0.7La0.3Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure unresolved | onset |
| Y0.6La0.4Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure unresolved | onset |
| Y0.5La0.5Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86 | Pressure unresolved | onset |
| Y0.4La0.6Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure unresolved | onset |
| Y0.3La0.7Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82 | Pressure unresolved | onset |
| Y0.2La0.8Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 81 | Pressure unresolved | onset |
| Y0.1La0.9Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 79 | Pressure unresolved | onset |
| LaBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 74 | Pressure unresolved | onset |
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