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Effect of substrate materials on laser deposited Nd1.85Ce0.15CuO4−y films

Published online by Cambridge University Press:  03 March 2011

Beesabathina D. Prasad ,
L. Salamanca-Riba ,
S.N. Mao ,
X.X. Xi ,
T. Venkatesan  and
X.D. Wu
Beesabathina D. Prasad
Affiliation:
Center for Superconductivity Research, Materials and Nuclear Engineering Department, University of Maryland, College Park, Maryland 20742-2115
L. Salamanca-Riba
Affiliation:
Center for Superconductivity Research, Materials and Nuclear Engineering Department, University of Maryland, College Park, Maryland 20742-2115
S.N. Mao
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742
X.X. Xi
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742
T. Venkatesan
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742
X.D. Wu
Affiliation:
STC, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

The growth morphology and interface structure of Nd1.85Ce0.15CuO4−y (NCCO) films grown by pulsed laser deposition on two different types of substrates, “perovskite” LaAlO3 (LAO) and SrTiO3 (STO) and “fluorite” Y2O3-stabilized ZrO2 (YSZ), were studied using cross-sectional electron microscopy. Structurally, the NCCO films are different when grown on the two types of substrates in three aspects: (i) epitaxy, (ii) substrate-film intermixing, and (iii) substrate-film interface roughness. In general, films deposited on “fluorite” substrates showed better superconducting properties than the films grown on “perovskite” substrates, especially for thinner films. Lattice mismatch considerations are not sufficient to explain the observed differences since films grown on the YSZ substrate showed sharp substrate-film interface in spite of their large lattice misfit. The atomic arrangements at the interface were analyzed in terms of electrostatic energy (charge balance) and matching of the oxygen sublattices in order to account for the experimental results.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 6 , June 1994 , pp. 1376 - 1383
Copyright
Copyright © Materials Research Society 1994

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References

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