By M. Cardona, G. Güntherodt
With contributions through a variety of specialists
Read Online or Download Light Scattering in Solids III: Recent Results PDF
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Extra resources for Light Scattering in Solids III: Recent Results
Example text
70] for the stage 1 acceptor CsAsF5 where no influence of the intercalant on the graphite b o u n d i n g layer m o d e was found in the t e m p e r a t u r e range spanning the order-disorder transition. Using a polarization analysis of the sharp spectral feature in the vicinity of 570 c m - 1, Eklund et al. 62] identified this feature with a zone folding of the M - p o i n t modes of the larger graphite Brillouin zone into the F point of the smaller zone for the intercalation c o m p o u n d , in accordance with the (2 x 2) inplane superlattice structure of CsCs, C s R b , and CaK.
Because of the high two-phonon density of states for co> 1600 cm-~, this coupling gives rise to a downshift of the Ezo 2 mode at the zone center. The good agreement Light Scattering in Graphite Intercalation Compounds ~ a) 1 ,g u~ (- .. E L_ 1120 t [ 37 Frequencydependent continuum Fig. 17a, b. Theoretical fits to the observed room temperature Raman spectrum for first stage CaCs in the broad frequency range l100 38]. The small stage dependent shift of the E°o~ mode frequency suggests that the intercalant transfers a small charge density which is spread over the graphite interior layers. This stage dependence is consistent with a stage-dependent strain occurring in both graphite bounding and interior layers. The upper frequency component of the doublet structure (Fig. 12) is identified with an E2o~-type graphitic mode occurring in a bounding graphite layer, and this mode is denoted by/~292. Support for this identification comes from the absence of the/~20~ line in pristine graphite, the increase of its intensity with increasing intercalate concentration and the occurrence of a single Ezo ~ line in stage 1 and stage 2 compounds, where all graphite layers are bounding layers.