Characteristics of oxygen over-reduced Nd1.85Ce0.15CuO4-y films

S. N. Mao, Wu Jiang, X. X. Xi, Qi Li, J. L. Peng, R. L. Greene, T. Venkatesan, D. Prasad Beesabathina, L. Salamanca-Riba, X. D. Wu

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Abstract

We have studied the oxygen doping effect in thin Nd1.85Ce0.15CuO4-y (NCCO) films. Contrary to the common believe that the disappearance of superconductivity in the over-reduced NCCO samples is a consequence of phase decomposition, we found that there exists an over-reduced region in which the crystallographic structure of the film remains essentially the same as in the optimum-oxygen doped region, but the film becomes insulating. Rutherford backscattering spectroscopy channeling analysis reveals that the oxygen over-reduction increases atomic distortion in the lattice. This work provides strong support to previous transport studies by Jiang et al. [Phys. Rev. Lett. 73, 1291 (1994)], which suggested the existence of both electron and hole carriers in superconducting NCCO.

Original languageEnglish (US)
Number of pages1
JournalApplied Physics Letters
DOIs
StatePublished - 1995

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Mao, S. N., Jiang, W., Xi, X. X., Li, Q., Peng, J. L., Greene, R. L., Venkatesan, T., Beesabathina, D. P., Salamanca-Riba, L., & Wu, X. D. (1995). Characteristics of oxygen over-reduced Nd1.85Ce0.15CuO4-y films. Applied Physics Letters. https://doi.org/10.1063/1.113928