Abstract
The main aim of this work is the electronic characterization of various Co oxide and precursor states on Ag(001), which grow during reactive deposition by evaporating Co from a Knudsen cell in an O 2 atmosphere. We have identified double-layer CoO(001) and monolayer and double-layer CoO(111), which show distinct differences in the I/ U and (d I/d U)/( I/ U) characteristics of scanning tunneling microscopy (STM)/scanning tunneling spectroscopy (STS). CoO(001) and, to some extent, also double-layer CoO(111) exhibit oxidic behavior. For CoO(001), the oxidic character is particularly recognized in the contrast dependence as a function of sample bias U.
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