Abstract
The surface structure and the surface electronic states of V2O5 were investigated using scanning tunneling microscopy/spectroscopy (STM/STS). The samples used in this experiment were prepared by annealing a cleaved crystal in an ultrahigh vacuum (UHV) to grow a reduced and lower oxide surface on its (001) plane. It was found that the crystal maintained the basic structure of V2O5 even after heat treatment, since the atomic images of the vanadyl oxygen alignments on the stoichiometric V2O5 (001) surface could be observed by STM on a few successively cleaved surfaces of the same sample. The STS spectra showed the local density of states peculiar to a reduced V2O5 surface, which were different from those of a stoichiometric V2O5 surface.
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