Detection of the nearly invisible defect that disrupts bulk superconductivity in Pr1.5Ce0.5Sr2Cu2NbO10
Howard A. Blackstead, John D. Dow, Israel Felner, W. B. Yelon, M. Chen, H. Luo, David B. Pulling
DOI 10.1103/PhysRevB.62.1244 · Physical Review B
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Abstract
Neutron diffraction measurements on Pr1.5Ce0.5Sr2Cu2NbO10 (Pr222Nb-10) show that the defect previously predicted as responsible for the lack of superconductivity PrSr (Pr on a Sr site), is present in the material in sufficient content to destroy the bulk superconductivity by magnetic scattering of Cooper pairs. Microwave power dissipation shows that the material, although previously thought to be an insulator, is in fact a granular superconductor with a superconducting transition temperature of ≈28 K. A Cu impurity electron spin resonance (ESR) is also detected. Mössbauer spectra show that some grains of the material contain ordered magnetism at the 57Fe site (Cu site), while others are superconducting. These results are interpreted in the context of recent observations on the similar-structure compound PrBa2Cu3O7, and indicate that in both materials Pr ions occupying alkaline-earth sites quench the superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr1.5Ce0.5Sr2Cu2NbO10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | onset |
| PrBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| YBaSrCu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | unknown |
| Pr2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | unknown |
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