Superconductivity in sulfur-containing R-Ba-Cu-O compounds
R. Gagnon, P. Fournier, M. Aubin, A. H. O'Reilly, J. E. Greedan
DOI 10.1103/PhysRevB.39.11498 · Physical Review B
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Abstract
We have prepared samples of RBa2Cu3OγSy (R=Y,Er,Nd) and studied them by x-ray powder diffraction, dc resistivity, and thermoelectric power measurements. All the compounds present a large proportion of secondary phases which are dominated by BaSO4, as confirmed by the x-ray-diffraction patterns. Samples with R=YorEr are still high-temperature superconductors confirming the fact that the sulfur atoms are not inserted, or with a very low proportion, in the 1:2:3 phase. In contrast, for the R=Nd samples, a semiconducting behavior is observed. A gradual transition from an orthorhombic to a tetragonal structure is obtained as the sulfur content is increased in NdBa2Cu3OγSy (0≤y≤1). This is not due to a sulfur insertion in the 1:2:3 phase. In fact, this phase is Ba deficient because of the formation of BaSO4 and some of the Nd substitutes for Ba in the 1:2:3 phase. That is, the resulting perovskitelike composition is Nd(Ba2−xNdx)Cu3O7+δ. This interpretation is consistent with a previous study of the solid solubility in the R(Ba2−xRx)Cu3O7+δ systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| ErBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| NdBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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