Phonons in solid picene at high pressures

Intercalated hydrocarbons have attracted considerable interest as a new class of superconductors. Calculations of the $e-ph$ interaction in different approximations yield conflicting results on the role of inter and intra-molecular vibrations in the pairing. We present an experimental and theoretical study of the phonon spectrum of solid picene under high pressure. We introduce a new theoretical analysics, based on the projection of phonon eigenvectors, to quantify the increase of intermolecular character under pressure. F. Capitani et al., Phys. Rev. B 88, 144303 (2013).