Abstract
Atomically resolved scanning tunneling microscope images of (0 0 1) cobalt and nickel monoxide surfaces are interpreted on the basis of LSDA+U surface electronic structure calculations. Different symmetry of dangling unoccupied d-bonds on CoO(0 0 1) and NiO(0 0 1) explains the origin of an order of magnitude difference in the contrast of tunnelling images observed for the two surfaces.
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