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Cation Ordering Structure in La0.8Ca0.2MnO3 Thin Films by Pulsed Laser Deposition

Published online by Cambridge University Press:  10 February 2011

Y. H. Li,
M. Rajeswari,
A. Biswasl,
D. J. Kang,
C. Sehmen,
L. Salamanca-Riba,
R. Ramesh and
T. Venkatesan
Y. H. Li
Affiliation:
NSF-MRSEC and Dept. of Materials and Nuclear Engineering and Center for Superconductivity Research, University of Maryland, College Park, MD 20742
M. Rajeswari
Affiliation:
Center for Superconductivity Research, University of Maryland, College Park, MD 20742
A. Biswasl
Affiliation:
Center for Superconductivity Research, University of Maryland, College Park, MD 20742
D. J. Kang
Affiliation:
Center for Superconductivity Research, University of Maryland, College Park, MD 20742
C. Sehmen
Affiliation:
Center for Superconductivity Research, University of Maryland, College Park, MD 20742
L. Salamanca-Riba
Affiliation:
NSF-MRSEC and Dept. of Materials and Nuclear Engineering and Center for Superconductivity Research, University of Maryland, College Park, MD 20742
R. Ramesh
Affiliation:
NSF-MRSEC and Dept. of Materials and Nuclear Engineering and Center for Superconductivity Research, University of Maryland, College Park, MD 20742Center for Superconductivity Research, University of Maryland, College Park, MD 20742
T. Venkatesan
Affiliation:
Center for Superconductivity Research, University of Maryland, College Park, MD 20742
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Abstract

A careful analysis of high-resolution transmission electron microscopy images from La0.8Ca0.2MnO3 thin films indicates that the images can not explained based on either the classical Pnma structure or its monoclinic distortion. A cation ordered structure is proposed which could be responsible for the significantly higher Tc of the film (298K) compared with the bulk material of the same composition (190K).

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