Abstract
We report a systematic lattice dynamics study of EuSi_{2} films and nanoislands by insitu nuclear inelastic scattering on ^{151}Eu and abinitio 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.
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