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Phonon Modes at the2H−NbSe2Surface Observed by Grazing Incidence Inelastic X-Ray Scattering Murphy, B. M. Requardt, H. Stettner, J. Krisch, M. Müller, M. Press, W. Serrano Gutiérrez, Jorge 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. European Synchrotron Radiation Facility - ESRF German Research Foundation 2024-01-30T12:40:57Z 2024-01-30T12:40:57Z 2005 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 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 eng info:eu-repo/semantics/openAccess application/pdf American Physical Society https://uvadoc.uva.es/bitstream/10324/65329/3/PhysRevLett.95.256104.pdf.jpg Hispana TEXT http://rightsstatements.org/vocab/CNE/1.0/ UVaDOC. Repositorio Documental de la Universidad de Valladolid https://uvadoc.uva.es/handle/10324/65329