Experimental evidence for the presence of nonacoustic excitations in molten Ga

The nature of the broad band of microscopic excitations measured in molten gallium is investigated by means of analysis of their mode eigenvectors I(Q,{omega}). The results, derived from neutron spectroscopy experiments, show that excitations with a dominant acoustic character are confined to low en...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2005-09, Vol.72 (10), p.104103.1-104103.10, Article 104103
Main Authors: BERMEJO, F. J, BUSTINDUY, I, LEVETT, S. J, TAYLOR, J. W, FERNANDEZ-PEREA, R, CABRILLO, C
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: structure, mechanical and thermal properties
COVALENCE
EIGENFUNCTIONS
EIGENVALUES
EIGENVECTORS
ENERGY TRANSFER
Exact sciences and technology
EXCITATION
EXCITED STATES
GALLIUM
Lattice dynamics
LIQUID METALS
NEUTRON SPECTRA
NEUTRON SPECTROSCOPY
OSCILLATIONS
Physics
STRUCTURE FACTORS
Vibrational states in disordered systems
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Summary:The nature of the broad band of microscopic excitations measured in molten gallium is investigated by means of analysis of their mode eigenvectors I(Q,{omega}). The results, derived from neutron spectroscopy experiments, show that excitations with a dominant acoustic character are confined to low energy transfers. In contrast, those appearing at higher frequencies unmistakably exhibit optical character, as evidenced by the out-of-phase relationship shown by the phase of oscillations in I(Q,{omega}) that become significantly shifted relative to those of the static structure factor. Such effects are shown to arise from partial covalency that is already known to be present in gaseous, cluster and crystalline forms.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.72.104103