Abstract
The stability fields of the NdCeCuO (NCCO) films and the Ce0.5Nd0.5O1.75 (CNO) phase grown by laser ablation from the stoichiometric targets, Nd1.85Ce0.15CuO4−8, are demonstrated, respectively. The superconducting NCCO films were grown in a specific field below and close to the CuO/Cu2O transition line, i.e., at 700–725°C in 20–50 mTorr, without vacuum annealing. On postdeposition cooling in lower oxygen pressures (<10 mTorr), the superconductivity of the NCCO films was significantly improved without vacuum annealing. The CNO phase usually appeared in the NCCO films at temperatures above 680 °C, and the higher the temperature the greater the CNO phase due to copper loss. A surplus of copper in the NCCO targets effectively suppressed the formation of the CNO phase, and thereby improved the superconductivity of the NCCO films.
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Lin, WT., Chen, GJ. Parametric study of in situ growth of NdCeCuO thin films by laser ablation. Journal of Materials Research 10, 2422–2427 (1995). https://doi.org/10.1557/JMR.1995.2422
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DOI: https://doi.org/10.1557/JMR.1995.2422