Physical review. B, Condensed matter · 1997 · 90 citations · 18 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid State PhysicsSurface ScienceCrystallographyDefects In Electronic MaterialsElectronic Structure Of SolidsScanning Probe MicroscopySurface CrystallographySurface PhysicsAtomic-resolution ImagingAtomic-scale Surface ImagingDirectional BondingNickel OxidesOxide Electronic StructurePoint DefectsStep EdgesSurface Terraces
Elevated-temperature scanning tunneling microscopy has been used to obtain atomic resolution images of (001) surfaces of NiO single crystals. Empty-state images of the (1\ifmmode\times\else\texttimes\fi{}1) surface show the nickel-atom sites and filled-state images show the oxygen ions in agreement with recent theoretical studies of the electronic structure of NiO. Empty-state and filled-state images of point defects and patterning effects observed on the upper terraces of 〈100〉 step edges are explained by directional 2p-3d covalent bonding between the oxygen and nickel sublattices.
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Magnitude and Origin of the Band Gap in NiO
G. A. Sawatzky, J. W. Allen · Physical Review Letters · 1984 · 939 citations