title: Measurement of the phason dispersion of misfit dislocations on the Au(111) surface.
abstract: We report measurements of the acoustic and optical phason dispersion curves associated with the lattice of partial dislocations on the reconstructed (111) surface of gold. Our measurements of these low energy (<0.5 meV) weakly dispersive modes have been enabled by the very high resolution of the novel helium spin-echo technique. The results presented here constitute the first measurement of the phason dispersion of misfit dislocations, and possibly of excitations associated with any type of crystalline dislocations.
authors.affiliation: The Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom. emb56@cam.ac.uk
authors.forename: E M
authors.initials: EM
authors.lastname: McIntosh
authors.forename: P R
authors.initials: PR
authors.lastname: Kole
authors.forename: M
authors.initials: M
authors.lastname: El-Batanouny
authors.forename: D M
authors.initials: DM
authors.lastname: Chisnall
authors.forename: J
authors.initials: J
authors.lastname: Ellis
authors.forename: W
authors.initials: W
authors.lastname: Allison