Structure and contrast in scanning tunneling microscopy of oxides: FeO monolayer on Pt(111)
- Materials Sciences Division, Lawrence Berkeley National Laboratory University of California, Berkeley, California 94720 (United States)
- Laboratoire de Chimie Theorique, Ecole Normale Superieure, 46, Allee d`Italie, 69464 Lyon (France)
We applied electron-scattering quantum-chemistry theory to investigate the origin of contrast in scanning tunneling microscopy images of iron oxide grown on Pt(111). We show that (a) image contrast and surface topography are not directly related; (b) the maxima in the images occur over O positions for Pt tips and over Fe positions for O-terminated tips; (c) the short-range corrugation is always due to O {ital p}{sub {ital z}} orbitals, with a small but important contribution of Fe; and (d) the state that carriers most of the tunneling current is located near the Fermi level and is made mostly of O {ital p}{sub {ital z}} and Fe 3{ital d}{sub {ital z}2} orbitals. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 388315
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 16 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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