Raman response of Stage-1 graphite intercalation compounds revisited



Chacón-Torres, JC, Ganin, AY, Rosseinsky, MJ ORCID: 0000-0002-1910-2483 and Pichler, T
(2012) Raman response of Stage-1 graphite intercalation compounds revisited. Phys. Rev. B, 86 (7). 075406-.

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Abstract

We present a detailed in-situ Raman analysis of stage-1 KC8, CaC6, and LiC6 graphite intercalation compounds (GIC) to unravel their intrinsic finger print. Four main components were found between 1200 cm-1 and 1700 cm-1, and each of them were assigned to a corresponding vibrational mode. From a detailed line shape analysis of the intrinsic Fano-lines of the G- and D-line response we precisely determine the position ({\omega}ph), line width ({\Gamma}ph) and asymmetry (q) from each component. The comparison to the theoretical calculated line width and position of each component allow us to extract the electron-phonon coupling constant of these compounds. A coupling constant {\lambda}ph < 0.06 was obtained. This highlights that Raman active modes alone are not sufficient to explain the superconductivity within the electron-phonon coupling mechanism in CaC6 and KC8.

Item Type: Article
Additional Information: 6 pages, 3 figures, 2 tables
Uncontrolled Keywords: physics.optics, physics.optics, cond-mat.mtrl-sci
Depositing User: Symplectic Admin
Date Deposited: 01 Aug 2016 10:28
Last Modified: 19 Jan 2023 07:32
DOI: 10.1103/physrevb.86.075406
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3002650