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Structure and Magnetotransport Properties of La2/3Ca1/3MnO3 Thin Films Prepared by Pulsed Laser Deposition

Published online by Cambridge University Press:  15 February 2011

O.I. Lebedev ,
G. van Tendeloo ,
S. Amelinckx ,
B. Leibold ,
H.-U. Habermeier  and
F. Phillipp
O.I. Lebedev
Affiliation:
EMAT, University of Antwerp (RUCA), Groenenborgerlaan 171, B-2020 Antwerp, Belgium on leave from Institute of Crystallography RAS, 117333 Moscow, Russia
G. van Tendeloo
Affiliation:
EMAT, University of Antwerp (RUCA), Groenenborgerlaan 171, B-2020 Antwerp, Belgium
S. Amelinckx
Affiliation:
EMAT, University of Antwerp (RUCA), Groenenborgerlaan 171, B-2020 Antwerp, Belgium
B. Leibold
Affiliation:
Max-Planck Institut für Festkörperforschung, D-70506 Stuttgart, Germany
H.-U. Habermeier
Affiliation:
Max-Planck Institut für Festkörperforschung, D-70506 Stuttgart, Germany
F. Phillipp
Affiliation:
Max-Planck Institut für Metallforschung, D-70506 Stuttgart, Germany
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Abstract

La1-xCaxMnO3-δ (LCMO) thin films are grown by pulsed laser deposition on a (100) SrTiO3 substrate at temperatures between 530°C and 890°C. The magnetotransport properties show a high negative magnetoresistance and a shift of the maximum of the R(T) curve as function of temperature. The Curie temperature changes with deposition temperature and film quality in the range of 100-220K. The film quality is characterised by X-ray diffraction and transmission electron microscopy (TEM); film and target compositions were verified by atomic emission spectroscopy. The local structure of the film depends on the growth conditions and substrate temperature. TEM reveals a slight distortion of the film leading to a breakdown of the symmetry from orthorhombic to monoclinic. At the highest growth temperatures, a well defined interface is observed within the LCMO film, parallel to the substrate surface; this interface divides the film into two lamellae with a different microstructure. The lamella close to the substrate is perfectly coherent with the substrate, suggesting that it is strained as a result of the lattice parameter mismatch; the upper lamella shows a typical domain structure with unusual translation interfaces characterised by a displacement vector of the type 1/2 [010]m and 1/2[001]m when referred to the monoclinic lattice.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 526: Symposium Y – Advances in Laser Ablation of Materials , 1998 , 219
Copyright
Copyright © Materials Research Society 1998

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