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Thin Film Synthesis of Copper-Based Perovskites Having Two-Dimensional Cation Order: (La0.8Ba0.2CuO2.6±x) (AECuO2)n Superlattices

Published online by Cambridge University Press:  16 February 2011

P.A. Salvador
Affiliation:
Laboratoire CRISMAT-ISMRA, CNRS UMR 6508, 6 Bd. du Maréchal Juin, 14050 Caen cedex, FRANCE Current address: Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh PA 15213-2890
T-D. Doan
Affiliation:
Laboratoire CRISMAT-ISMRA, CNRS UMR 6508, 6 Bd. du Maréchal Juin, 14050 Caen cedex, FRANCE
B. Mercey
Affiliation:
Laboratoire CRISMAT-ISMRA, CNRS UMR 6508, 6 Bd. du Maréchal Juin, 14050 Caen cedex, FRANCE
B. Raveau
Affiliation:
Laboratoire CRISMAT-ISMRA, CNRS UMR 6508, 6 Bd. du Maréchal Juin, 14050 Caen cedex, FRANCE
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Abstract

Using a multi-target pulsed laser deposition (PLD) process we synthesized superlattices in the (La0.8Ba0.2CuO2.6±x)m(AECuO2) n system, where AE = Ca or Sr, and m and n were varied. Owing to the sequential deposition process, two-dimensional order is obtained on the perovskite A-sites in the superlattice structures, as evidenced by X-ray diffraction for the materials where AE = Sr. However, when AE = Ca, the films were unstable. Structural units of CaCuO2 could be incorporated into the superlattices by containing them between layers of SrCuO2: (SrCuO2)l(CaCuO2)m(SrCuO2)l(La0.8Ba0.2CuO2.6±x)n. The stability and structural characteristics of particular stacking sequences are discussed with respect to their chemical preferences and are compared to bulk materials of similar stoichiometries, i.e., the (La,AE)CuO3-x system. The latter materials do not exhibit two-dimensional cation-order. Resistance measurements of as-synthesized and post-annealed materials are also discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 1999

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Thin Film Synthesis of Copper-Based Perovskites Having Two-Dimensional Cation Order: (La0.8Ba0.2CuO2.6±x) (AECuO2)n Superlattices
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Thin Film Synthesis of Copper-Based Perovskites Having Two-Dimensional Cation Order: (La0.8Ba0.2CuO2.6±x) (AECuO2)n Superlattices
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