Raman response of stage-1 graphite intercalation compounds revisited

Autor(en)

Julio Cesar Chacon Torres, Alexey Yu Ganin, Matthew J. Rosseinsky, Thomas Pichler

Abstrakt

We present a detailed in situ Raman analysis of stage-1 KC8, CaC6, and LiC6 graphite intercalation compounds to unravel their intrinsic fingerprint. 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 allows 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.

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

University of Liverpool

Journal

Physical Review B

Band

86

Anzahl der Seiten

6

ISSN

1098-0121

DOI

https://doi.org/10.1103/PhysRevB.86.075406

Publikationsdatum

2012

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie, 103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/040429a9-5b6c-4ab2-bb0a-60d5212474f5