Comment on “Out-of-plane effect on the superconductivity of Sr2−xBaxCuO3+δ with Tc up to 98 K”
T. H. Geballe, M. Marezio
DOI 10.1103/PhysRevB.82.216501 · Physical Review B
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Abstract
Gao et al. [Phys. Rev. B 80, 094523 (2009)] attribute the increase in the superconducting transition temperature of metastable Sr2CuO4−v to the increase in volume that is achieved by replacing 30% of the Sr in Sr2CuO4−v by Ba. We note that when the samples with and without the Ba substitution are properly normalized there is no such effect and offer an alternative explanation for their data.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2-xBaxCuO3+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98 | Pressure not reported | onset |
| Sr1.4Ba0.6CuO4-v Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98 | Pressure not reported | onset |
| Sr2CuO4-v Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | onset |
| Sr2CuO4-v Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | unknown |
| Sr2CuO4-v Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
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