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Parametric study of in situ growth of NdCeCuO thin films by laser ablation

Published online by Cambridge University Press:  03 March 2011

Wen-Tai Lin  and
Guo-Ju Chen
Wen-Tai Lin
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan 700, Republic of China
Guo-Ju Chen
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan 700, Republic of China
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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.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 10 , October 1995 , pp. 2422 - 2427
Copyright
Copyright © Materials Research Society 1995

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References

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