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29 March 2024
 
  » pubmed » pmid16384477

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Phonon modes at the 2H-NbSe2 surface observed by grazing incidence inelastic x-ray scattering
B M Murphy ; H Requardt ; J Stettner ; J Serrano ; M Krisch ; M Müller ; W Press ;
Date 16 Dec 2005
Journal Phys Rev Lett, 95 (25), 256104
AbstractWe have determined the dispersion of acoustic and optical surface phonon modes 2H-NbSe2 at the by inelastic x-ray scattering under grazing incidence conditions. Already, at room temperature, an anomaly is observed close to the charge density wave -vector position located at about one-third along the Gamma-M direction of the Brillouin zone. Our results indicate that the anomaly for the surface mode occurs at a lower energy than that measured in bulk sensitive geometry in the same experiment, showing evidence of a modified behavior in the uppermost layers. We demonstrate that inelastic x-ray scattering in grazing incidence conditions provides a unique tool to selectively study either surface or bulk lattice dynamics in a single experiment.
Source PubMed, pmid16384477
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