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We present atomic scale images of a V_2O_3 (0001)-surface, which show thatthe surface is susceptible to reconstruction by dimerization of vanadium ions.The atomic order of the surface depends sensitively on the surface preparation.Scanning tunneling spectroscopy proves a dimerized surface has a gap in theelectronic density of states at the Fermi energy, while a surface prepared bysputtering and successive annealing shows no dimerization and no gap.Photoemission spectra depend sensitively on the surface structure and areconsistent with scanning tunneling spectroscopy data. The measurements explaininconsistencies in photoemission experiments performed on such oxides in thepast.Comment: REVTeX, 4 pages, 6 EPS figures, submitted to PR

physical review. b, condensed matter and materials physics

Atomic-scale imaging and spectroscopy of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">V</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(0001) surface: Bulk versus surface effects

Atomic-scale imaging and spectroscopy of theV2O3(0001) surface: Bulk versus surface effects