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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 | Abstract: | We 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 | Services: | Forum | Review | Favorites |
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