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- W51178695 abstract "The superconducting properties of the electron doped materials ${L}_{2ensuremath{-}x}(mathrm{C}mathrm{e},mathrm{T}mathrm{h}{)}_{x}{mathrm{CuO}}_{y}$ $(L=mathrm{Nd}, mathrm{Sm}, mathrm{Pr}, mathrm{and}mathrm{}mathrm{Eu})$ 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 $mathrm{CuO}ensuremath{-}{mathrm{Cu}}_{2}mathrm{O}$ equilibrium. We present a detailed Raman scattering investigation of ${mathrm{Nd}}_{1.85}{mathrm{Ce}}_{0.15}{mathrm{Cu}}_{1+d}{mathrm{O}}_{y}$ 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 ${mathrm{CuO}}_{2}$ planes in these compounds leading to a subtle internal strain that quenches the superconducting state." @default.
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- W51178695 date "2001-04-04" @default.
- W51178695 modified "2023-09-25" @default.
- W51178695 title "Reduction step and quenching of superconductivity inNd1.85Ce0.15Cu1.01Oy:A Raman scattering study" @default.
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- W51178695 doi "https://doi.org/10.1103/physrevb.63.184503" @default.
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