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James Loudon, Department of Materials Science, University of Cambridge
Tuesday 27 November 2007, 15:00-16:00
Valence Changes and Structural Distortions in 'Charge Ordered' Manganites Quantified by Atomic-Scale Scanning Transmission Electron Microscopy
- đ¤ Speaker: James Loudon, Department of Materials Science, University of Cambridge
- đ Date & Time: Tuesday 27 November 2007, 15:00 - 16:00
- đ Venue: T001 [Tower Seminar Room], Materials Science and Metallurgy, Department of
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Nathan Church
Abstract
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 Âą 0.001)a and longitudinal amplitude (0.003 Âą 0.001)a. Energy loss spectra taken across the stripes show no periodic changes and place an upper bound of Âą0.04 on any valence changes of the Mn ions.
Series This talk is part of the Electron Microscopy Group Seminars series.
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