title: Anomalous Lattice Dynamics of EuSi_{2} Nanoislands: Role of Interfaces Unveiled.
abstract: We report a systematic lattice dynamics study of EuSi_{2} films and nanoislands by in situ nuclear inelastic scattering on ^{151}Eu and ab initio theory. The Eu-partial phonon density of states of the nanoislands exhibits anomalous excess of phonon states at low and high energies, not present in the bulk and at the EuSi_{2}(001) surface. We demonstrate that atomic vibrations along the island-substrate interface give rise to phonon states both at low and high energies, while atomic vibrations across the island-island interface result in localized high-energy phonon modes.
authors.affiliation: Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany.|Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Seiler
authors.affiliation: Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Kraków, Poland.
authors.forename: P
authors.initials: P
authors.lastname: Piekarz
authors.affiliation: Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany.|Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Ibrahimkutty
authors.affiliation: ESRF-The European Synchrotron, F-38000 Grenoble, France.
authors.forename: D G
authors.initials: DG
authors.lastname: Merkel
authors.affiliation: Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany.|Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: O
authors.initials: O
authors.lastname: Waller
authors.affiliation: Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany.|Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Pradip
authors.affiliation: ESRF-The European Synchrotron, F-38000 Grenoble, France.
authors.forename: A I
authors.initials: AI
authors.lastname: Chumakov
authors.affiliation: ESRF-The European Synchrotron, F-38000 Grenoble, France.
authors.forename: R
authors.initials: R
authors.lastname: Rüffer
authors.affiliation: Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany.|Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany.|ANKA Synchrotron Radiation Facility, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Baumbach
authors.affiliation: Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Kraków, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Parlinski
authors.affiliation: Freiburg Materials Research Center, University of Freiburg, D-79104 Freiburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Fiederle
authors.affiliation: Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany.|Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Stankov