Comment on “Origin of the superconductivity in the Y-Sr-Ru-O and Y-Sr-Cu-O systems”
H. A. Blackstead, P. J. McGinn, M. P. Smylie, W. B. Yelon, J. B. Yang, W. J. James
DOI 10.1103/PhysRevB.79.016501 · Physical Review B
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Abstract
Galstyan et al. [Phys. Rev. B 76, 014501 (2007)] asserted that superconductivity reported for Sr2YRu1−uCuuO6 is due to inclusions of YSr2Cu3O7. We have synthesized samples of this magnetic material (u=0.10) which exhibit diamagnetism exceeding that possible even if all of the available dopant Cu were present in YSr2Cu3O7. Our materials were studied with neutron diffraction, scanning electron microscopy, energy dispersive x-ray analysis, and SQUID magnetometry. We found no evidence for inclusions of YSr2Cu3O7. Despite their claim, this is in agreement with a primary finding of Galstyan et al. that granular YSr2Cu3O7 is present only in material doped with Cu at 250% of the known Cu solubility limit. The lack of superconductivity at low Cu doping in their material is likely due to their failure to follow published synthesis procedures. It is concluded that the findings of Galstyan et al. actually support our contention that properly synthesized Sr2YRu1−uCuuO6 is a single phase material which exhibits high temperature superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2YRu1-uCuuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | onset |
| YSr2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 64 | Pressure not reported | onset |
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