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oai:uvadoc.uva.es:10324/653292025-02-13T09:50:30Zcom_10324_1158com_10324_931com_10324_894col_10324_1242

Murphy, B. M. Requardt, H. Stettner, J. Krisch, M. Müller, M. Press, W. Serrano Gutiérrez, Jorge 2024-01-30T12:40:57Z 2024-01-30T12:40:57Z 2005 Phys. Rev. Lett. 95, 256104 (2005) 0031-9007 https://uvadoc.uva.es/handle/10324/65329 10.1103/PhysRevLett.95.256104 25 Physical Review Letters 95 1079-7114 We have determined the dispersion of acoustic and optical surface phonon modes at the 2H−NbSe2 by inelastic x-ray scattering under grazing incidence conditions. Already, at room temperature, an anomaly is observed close to the charge density wave Q-vector position located at about one-third along the Γ−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. eng info:eu-repo/semantics/openAccess Phonon Modes at the2H−NbSe2Surface Observed by Grazing Incidence Inelastic X-Ray Scattering info:eu-repo/semantics/article