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Observation of a (7*1) surface reconstruction on Y(1120)

A study of the surface reconstruction of Y(1120) has shown a sixfold-symmetric low-energy electron diffraction pattern in contrast to the twelvefold-symmetric pattern reported earlier. This indicates that only one orientation of close-packed atoms exists on the surface; the collapse of the surface unit cell is uniaxial along the (0001) direction. This produces the same commensurate surface structure as found previously for the (1120) (7*1) reconstructions of Ho and Er. Why the earlier study of Y showed a two-domain reconstruction has not been determined, but they suggest that this structure was influenced by the presence of surface defects, inducing the collapse of the unit cell along the (1010) direction to form an incommensurate domain with approximately equal probability to that of the commensurate (7*1) domain.