Valence Changes and Structural Distortions in 'Charge Ordered' Manganites Quantified by Atomic-Scale Scanning Transmission Electron Microscopy

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• James Loudon, Department of Materials Science, University of Cambridge
• Tuesday 27 November 2007, 15:00-16:00
• T001 [Tower Seminar Room], Materials Science and Metallurgy, Department of.

If you have a question about this talk, please contact Nathan Church.

We investigate the microscopic nature of the ‘charge ordering’ modulation in mixed-valent manganites in real space using scanning transmission electron microscopy. The modulation in Bi0.5Sr0.4Ca0.1MnO3 has a uniform periodicity appearing as stripes in high-angle annular dark field images. Geometric phase analysis shows the modulation to be a displacement wave with transverse amplitude (0.008 ± 0.001)a and longitudinal amplitude (0.003 ± 0.001)a. Energy loss spectra taken across the stripes show no periodic changes and place an upper bound of ±0.04 on any valence changes of the Mn ions.

This talk is part of the Electron Microscopy Group Seminars series.

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