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Microstructure of laser-ablated superconducting La2CuO4Fx thin films on SrTiO3

Published online by Cambridge University Press:  31 January 2011

G. Kong
Affiliation:
School of Metallurgy and Materials, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
M. O. Jones
Affiliation:
School of Metallurgy and Materials, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
J. S. Abell
Affiliation:
School of Metallurgy and Materials, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
P. P. Edwards*
Affiliation:
School of Chemistry and the School of Metallurgy and Materials, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
S. T. Lees
Affiliation:
School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
K. E. Gibbons
Affiliation:
School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
I. Gameson
Affiliation:
School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
M. Aindow
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, 97 North Eagleville Road, Unit 3136, University of Connecticut, Storrs, Connecticut 06269–3136
*
b) Address all correspondence to this author.
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Abstract

Thin films of lanthanum cuprate were grown on SrTiO3 substrates by pulsed laser deposition and made superconducting (Tc ∼ 38 K) through the process of post-deposition fluorination using elemental fluorine. A microstructural analysis showed that the [110] zone of the film grows parallel to the [100] zone of the SrTiO3 substrate, reducing the lattice mismatch from 37.5% to 2.4%. At the film–substrate interface there is an intermediate layer 3–4 nm thick and twin-related grains emanate from this region. Stacking faults are present in the bulk of the film, with misoriented subgrains present at the deposit surface.

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Articles
Copyright
Copyright © Materials Research Society 2001

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