Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-10-04
Nat. Commun. 2:212 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
7 figures
Scientific paper
10.1038/ncomms1219
Manganites are technologically important materials, used widely as solid oxide fuel cell cathodes: they have also been shown to exhibit electroresistance. Oxygen bulk diffusion and surface exchange processes are critical for catalytic action, and numerous studies of manganites have linked electroresistance to electrochemical oxygen migration. Direct imaging of individual oxygen defects is needed to underpin understanding of these important processes. It is not currently possible to collect the required images in the bulk, but scanning tunnelling microscopy could provide such data for surfaces. Here we show the first atomic resolution images of oxygen defects at a manganite surface. Our experiments also reveal defect dynamics, including oxygen adatom migration, vacancy-adatom recombination and adatom bistability. Beyond providing an experimental basis for testing models describing the microscopics of oxygen migration at transition metal oxide interfaces, our work resolves the long-standing puzzle of why scanning tunnelling microscopy is more challenging for layered manganites than for cuprates.
Aeppli Gabriel
Bryant Benjamin
Renner Christoph
Tokunaga Yusuke
Tokura Yoshinori
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