1207.6364 (P. Giura et al.)

Temperature evolution of infrared- and Raman-active phonons in graphite    [PDF]

P. Giura, N. Bonini, G. Creff, J. B. Brubach, P. Roy, M. Lazzeri

We perform a comparative experimental and theoretical study of the temperature dependence up to 700 K of the frequency and linewidths of the graphite E1u and E2g optical phonons (~1590 and 1580 cm-1) by infra-red (IR) and Raman spectroscopy. Despite their similar character, the temperature dependence of the two modes is quite different, being, e.g., the IR shift almost two times stronger than the Raman one. Ab initio calculations of the anharmonic properties are in remarkable agreement with measurements and explain the observed behavior.

View original: http://arxiv.org/abs/1207.6364