Abstract
Pressure-induced neutral to ionic phase transitions in mixed stack charge transfer crystals have been studied by Raman spectroscopy. In the case of tetrathiafulvalene-chloranil, an accurate determination of the ionicity variation with pressure has yielded a precise characterization of the phase transition, which occurs discontinuously at about 1.1 GPa. The possible presence of ionic dimers embedded in the neutral chains as precursors of the phase change is discussed. Preliminary measurements on the rather similar compound tetrathiafulvalene-2,5dichloroparabenzoquinone suggest the possibility of a continuous neutral to ionic transition.
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