Fluctuation of charge density wave of TTF–TCNQ under extreme pressure

Abstract We have presented that the charge density wave (CDW) in TTF–TCNQ is suppressed by extremely high hydrostatic pressure (8 GPa). To understand the nature of CDW under pressure, we shed light on the fluctuation of CDW under pressure, by examining the resistance anisotropy and their temperature dependence along the b -axis (1D) and a -axis. It turned that the fluctuation of CDW above T CDW continues to be present in the whole pressure range where CDW is present, but is gradually suppressed as CDW is suppressed. Also remarkable is that this behavior is only observed in the resistance behavior along the b -axis (1D) but not along the a -axis.