A novel metal–insulator phase transition observed in (EDO-TTF)₂PF₆

Theoretical Studies on Phase Transitions in Quasi-One-Dimensional Molecular Conductors

“…On the other hand, materials known from early days such as the compounds showing SP transition, MEM-(TCNQ) 2 and (BCPTTF) 2 X (X = PF 6 , AsF 6 ) [58][59][60], might be interesting to revisit with renewed understandings. In (EDO-TTF) 2 PF 6 [61], a strong first-order phase transition is observed which is not reproduced in theory. More systematic comparisons are required.…”

Local response to light excitation in the charge-ordered phase of(EDO−TTF)2SbF6

“…The counteranion in the family of (EDO-TTF) 2 XF 6 compounds has always been considered to be of prime importance in the thermal transition [11] and its role in the photoinduced transformation was evoked by recent time-resolved electron diffraction experiments. However, until now, the fundamental importance of its size in photoinduced phenomena was not discussed.…”

“…This generates two independent pairs of donor dimers centered on inversion symmetry with two different formal charges. These charges are empirically estimated from intermolecular bond length obtained by x-ray diffraction [11,23,24] or by maximum entropy method [12]. The alternation of bent neutral and flat ionized dimers is characteristic of this charge order as observed at 150 K in in the I phase.…”

“…The main feature is the charge order along donor stack ( [11][12][13]. For photoinduced transformation, the similarity between relaxation dynamics of reflectivity and optical conductivity, both occurring on the microsecond scale, indicates that a transient metallic state is generated on this time scale [5].…”

Wavefunction Analysis of STM Image: Surface Reconstruction of Organic Charge Transfer Salts

“…In this chapter, the STM images in the surface donor layers of the three charge transfer salts, α-(BEDT-TTF) 2 I 3 , known as a bulk Dirac Fermion system under pressure [19], β-(BEDT-TTF) 2 I 3 with superconducting transition [20] and (EDO-TTF) 2 PF 6 (EDO-TTF= ethylene dioxy tetrathiafulvalene) with multi-instability around room temperature (RT) [21,22] are analyzed with the atomic π electron orbitals of sulfur, oxygen and carbon atoms, which are the main carrier of the π electrons. These salts have segregated 2D layers of the BEDT-TTF or EDO We have deduced three different kinds of surface molecular reconstructions by the electron wavefunction analysis of STM images, as follows.…”