VIBRATIONAL SPECTROSCOPY OF METALLIC-CONDUCTORS, SEMICONDUCTORS, AND SUPERCONDUCTORS

A review on vibrational spectroscopy in metallic, semiconducting and s uperconducting systems is given. The first part is tutorial and descri bes the differences between vibrational spectroscopy in molecules and in solids and compares various basic experimental techniques like IR-s pectroscopy, Raman spectroscopy and neutron scattering. Examples from the field of semiconductors, conductors and superconductors are discus sed. In the second part new results from vibrational spectroscopy in t he field of fullerenes for the insulating and for the metallic state a re given. Evidence for various phase transitions and for a strong and highly selective electron-phonon interaction is demonstrated from Rama n scattering and IR reflectivity experiments.