Raman modes and Grüneisen parameters of graphite under compressive biaxial stress
Del Corro, Elena (Universidad Complutense de Madrid. Departamento de Química Física)
Otero-De-La-Roza, Alberto (University of California)
Taravillo, Mercedes (Universidad Complutense de Madrid. Departamento de Química Física)
Garcia Baonza, Valentin (Universidad Complutense de Madrid. Departamento de Química Física)

Additional title:	Graphite under compressive biaxial stress : Raman modes and Grüneisen parameters
Date:	2012
Abstract:	We study the behaviour of the most characteristic Raman contributions of highly oriented pyrolytic graphite at biaxial stresses up to 5 GPa. We use moissanite anvils to compress the samples, which allowed us to observe for the first time the evolution with stress of the disorder-induced D band along with all the overtones and combination bands in the Raman spectrum of graphite. Theoretical calculations at different pressures, performed within the density functional theory, are provided to confirm that the D band process involves iTO phonons along the K-Γ direction. A complete set of Grüneisen parameters is reported for all the features of the Raman spectrum of graphite; the analysis of the ratios of such parameters provides direct information on the intrinsic coupling and stress response of each phonon branch.
Grants:	Ministerio de Ciencia e Innovación CTQ2009-14596-C02-01 Ministerio de Educación y Ciencia CSD2007-00045
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Biaxial stress ; Combination bands ; Highly oriented pyrolytic graphite ; Moissanite ; Phonon branches ; Raman modes ; Stress response ; Theoretical calculations
Published in:	Carbon, Vol. 50, Issue 12 (October 2012) , p. 4600-4606, ISSN 0008-6223

DOI: 10.1016/j.carbon.2012.05.046

Postprint 23 p, 1.1 MB

The record appears in these collections:
Articles > Research articles
Articles > Published articles