Title

Atomic vibrations in iron nanoclusters: Nuclear resonant inelastic x-ray scattering and molecular dynamics simulations

Authors

Authors

B. R. Cuenya; A. Naitabdi; J. Croy; W. Sturhahn; J. Y. Zhao; E. E. Alp; R. Meyer; D. Sudfeld; E. Schuster;W. Keune

Comments

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Abbreviated Journal Title

Phys. Rev. B

Keywords

DENSITY-OF-STATES; SYNCHROTRON-RADIATION; PHONONS; CLUSTERS; SURFACES; NICKEL; Physics, Condensed Matter

Abstract

The lattice vibrational dynamics of supported, self-assembled, isolated (57)Fe nanoclusters was studied by nuclear resonant inelastic x-ray scattering and molecular dynamics calculations. The morphological and structural properties and the chemical state of the experimental nanoclusters were investigated by atomic force microscopy, high resolution transmission electron microscopy, and x-ray photoelectron spectroscopy. The measured and calculated vibrational densities of states (VDOSs) reveal an enhancement of the low- and high-energy phonon modes and provide experimental and theoretical proof of non-Debye-like behavior in the low-energy region of the VDOS. Experimentally, this effect was found to depend on the nature of the surface shell (oxide or carbide) of the core/shell nanoclusters. According to the calculations for supported isolated pure Fe nanoclusters, the non-Debye-like behavior appears not only in the surface shell but also in the bcc-Fe core of the nanocluster due to the hybridization of surface and bulk modes.

Journal Title

Physical Review B

Volume

76

Issue/Number

19

Publication Date

1-1-2007

Document Type

Article

Language

English

First Page

5

WOS Identifier

WOS:000251326800127

ISSN

1098-0121

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