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Surface potential of a polar oxide film: FeO on Pt(111)

MPG-Autoren
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Rienks,  Emile D. L.
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Nilius,  Niklas
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Rust,  Hans-Peter
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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PhysRevB.71.241404.pdf
(Verlagsversion), 604KB

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Zitation

Rienks, E. D. L., Nilius, N., Rust, H.-P., & Freund, H.-J. (2005). Surface potential of a polar oxide film: FeO on Pt(111). Physical Review B, 71(24), 241404–1-241404–4. doi:10.1103/PhysRevB.71.241404.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0011-0864-3
Zusammenfassung
We have studied a thin FeO film on Pt(111) using scanning tunneling microscopy. The corrugation of the Moiré pattern, that arises due to a lattice mismatch between the oxide film and the substrate, is found to increase dramatically when the microscope is operated in the field-emission regime. This contrast enhancement can be attributed to variations in the energy at which field-emission resonances are observed. We assign this effect to variations of the surface potential within the Moiré unit cell. Using a simple electrostatic model we show that in this oxide film with polar termination, such variations can be induced by very subtle differences in geometry.