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Commensurate-incommensurate phase transition in charge ordered La1-xCaxMnO3 by single crystal diffraction and electron imaging

Published online by Cambridge University Press:  11 February 2011

Jing Tao ,
Y Murakami  and
Jian-min Zuo
Jing Tao
Affiliation:
Department of Material Science and Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, U.S.A
Y Murakami
Affiliation:
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980–8577, Japan
Jian-min Zuo
Affiliation:
Department of Material Science and Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, U.S.A
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Abstract

Electron nanodiffraction from single crystal domain of La1-xCaxMnO3 with 0.5 ≤ × ≤ 0.8 is carried out to study the charge ordering phase transition in this system. The melting processes of charge ordering structure in samples with x = 1/2, 2/3 and 4/5 are observed in-situ by increasing temperature from 93K – 298K. During the phase transition, electron diffraction results show that the nearly commensurate low-temperature charge ordering structure continuously evolves to incommensurate structure with directly decreasing sizes of charge ordered area. The picture of this phase transition is confirmed by the real space imaging. The real space images clearly show the introduction of charge ordering defects during the melting process in this sample.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 755: Symposium DD – Solid-State Chemistry of Inorganic Materials IV , 2002 , DD2.9
Copyright
Copyright © Materials Research Society 2003

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References

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