Abstract :
We have measured the temperature dependences of the conductance G and the dielectric permittivity ε′ of the (TMTTF)2SbF6 compound under a moderate pressure. The maximum of G(T) associated with the Mott–Hubbard localization disappears under pressure. With increasing pressure the peak in ε′(T), corresponding to the charge ordering (CO) phase transition, shifts to lower temperatures and broadens. At pressures above 0.24 GPa, ε′(T) becomes strongly frequency dependent. These modifications are explained in the frame of the extended Hubbard model and a slowing down behavior.
