Abstract
We have examined the structure of the {001} surface of Nb by LEED and have found that a (1 × 1) diffraction pattern prevails over the entire range of temperature investigated, that is 15–1000 K. This is the first observation of an unreconstructed {001} surface of a bcc metal over such a temperature range. This result is consistent with a reconstruction mechanism requiring the coupling of occupied surface states and is expected to further theoretical development of the mechanism of surface reconstruction.
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