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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
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.
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- Copyright © Materials Research Society 2003