title: Surface phonon dispersion of [Formula: see text].
abstract: Surface phonon dispersion of [Formula: see text]-B was measured using high resolution electron energy loss spectroscopy. With adsorption of excess boron, an ordered structure of [Formula: see text] is found at the B coverage of about 0.8 ML. Another structure of 4 × 4 appears mixed with the [Formula: see text] phase at a higher coverage. Using the phonon dispersion relations, the [Formula: see text] structure is inferred to consist of a planar boron network, as in the bulk. In contrast to the NbB(2)(0001) case, no surface core level shift of B 1s is observed on this [Formula: see text] surface, suggesting that the planar boron is not outermost.
authors.affiliation: National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Aizawa
authors.forename: S
authors.initials: S
authors.lastname: Suehara
authors.forename: S
authors.initials: S
authors.lastname: Hishita
authors.forename: S
authors.initials: S
authors.lastname: Otani