Abstract
We have studied dielectric properties of (BEDT-TTF)(CIMeTCNQ) around the neutral-ionic (NI) transitions, whose critical temperatures can be tuned from 300 K to 0 K by variation of pressure in the range between 0.25 ∼ 1.0 GPa. We found that thermal-activation-type dielectric response becomes predominant around the transitions higher than 50 K, while Curie-Weiss type enhancement was not detected above the transitions. Here we feature the dielectric properties in the range above 50 K, so as to contrast another type of dielectrical enhancement observed around the quantum critical point of the NI valence instabilities in (BEDT-TTF)(ClMeTCNQ).
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