High pressure effects on the Raman spectrum of CsC60 polymer

The effect of high pressure (up to 11 GPa) on the phonon modes of o-CsC60 p olymer has been studied by means of Raman spectroscopy. The pressure depend ence of all the observed phonon frequencies exhibits reversible changes in the pressure region 4.3 +/- 0.5 GPa. The width of the H-8(8) mode increases almost linearly with increasing pressure up to similar to 4.3 GPa, above w hich it seems to remain constant. All the above changes may be related to t he metal insulator transition observed below 50 K for the material under in vestigation and/or with the structural changes, induced by pressure and obs erved also by X-ray diffraction measurements, (C) 1999 Elsevier Science B.V . All rights reserved.