Abstract
THE recent report1 of superconductivity in Nd1,85Ce0.15CuO4 is the first example of a high-transition-temperature (high– Tc) super-conductor with electrons as the charge carriers and a formal copper oxidation state of less than +2. All previously characterized copper oxide superconductors are hole-doped, and the copper is formally oxidized. Here we show that substitution of fluorine for oxygen in T′-phase Nd2CuO4 provides an alternative route to achieving formal reduction of copper, electron conductivity and superconductivity at temperatures as high as 27 K. This result is unusual, because anionic rather than cationic substitution gives rise to the superconductivity.
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James, A., Murphy, D. & Zahurak, S. Superconductivity at 27 K in fluorine-doped Nd2Cu04. Nature 338, 240–241 (1989). https://doi.org/10.1038/338240a0
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DOI: https://doi.org/10.1038/338240a0
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