Reduction step and quenching of superconductivity in Nd1.85Ce0.15Cu1.01Oy: A Raman scattering study
A. Fainstein, A. Serquis, R. G. Pregliasco, F. Prado, A. Caneiro, S. Piñol
DOI 10.1103/PhysRevB.63.184503 · Physical Review B
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Abstract
The superconducting properties of the electron doped materials L2−x(Ce,Th)xCuOy (L=Nd, Sm, Pr, andEu) are extremely sensitive to small variations of the oxygen content. Superconductivity only appears in samples that are quenched under slightly reduced atmospheres, at oxygen partial pressures below a critical value corresponding to the CuO−Cu2O equilibrium. We present a detailed Raman scattering investigation of Nd1.85Ce0.15Cu1+dOy ceramic and single crystalline samples prepared under controlled oxygen content above and below this critical oxygen partial pressure. The Raman scattering spectra show that CuO traces are present in all the samples prepared above the critical partial pressure and discontinuously disappear for the superconducting compounds. These results suggest that CuO might intergrow with the CuO2 planes in these compounds leading to a subtle internal strain that quenches the superconducting state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd1.85Ce0.15Cu1.01Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nd1.85Ce0.15CuOy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
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