Phase selectivity in the simultaneous synthesis of the Tc = 12.8 K (0.3 kbar) organic superconductor .kappa.-(BEDT-TTF)2Cu[N(CN)2]Cl or the semiconductor (BEDT-TTF)Cu[N(CN)2]2

Magnetic and Electric Properties of Organic Conductors Probed by 13C-NMR Using Selective-Site Substituted Molecules

“…Organic conductors consisting of molecular donor and inorganic anion have been the subject of intense interest because of their low dimensionality, magnetism, and superconductivity [1][2][3][4]. Among them, (TMTCF) 2 X (C = S; TMTTF: tetra-methyl-tetra-thia-fulvalene, C = Se; TMTSF: tetra-methyl-tetra-selena-fulvalene) salts are known as quasi-one dimensional organic conductors, and, moreover, (BEDT-TTF) 2 X (BEDT-TTF: bis-(ethylene-dithio)-tetra-thia-fulvalene) salts are known as quasi-two dimensional organic conductors, where X − is a monovalent inorganic anion.…”

“…Among (TMTSF) 2 X, the so-called Bechgaard salt, (TMTSF) 2 PF 6 is the first organic superconductor, and the superconductivity emerges at 1.6 K under pressure of 0.65~1 GPa [6]. In (TMTSF) 2 ClO 4 which consists of the same donor molecule, the superconductivity emerges at 1.2 K at ambient pressure [7]. In TMTTF salt, (TMTTF) 2 AsF 6 and (TMTTF) 2 SbF 6 show charge ordered (CO) state below 100 K and 157 K, and theoretical and experimental studies have been performed from the view of the relationship between CO system and magnetism emerging at lower temperature [8][9][10].…”

“…In (TMTSF) 2 ClO 4 which consists of the same donor molecule, the superconductivity emerges at 1.2 K at ambient pressure [7]. In TMTTF salt, (TMTTF) 2 AsF 6 and (TMTTF) 2 SbF 6 show charge ordered (CO) state below 100 K and 157 K, and theoretical and experimental studies have been performed from the view of the relationship between CO system and magnetism emerging at lower temperature [8][9][10]. Moreover, (TMTTF) 2 Br shows commensurate antiferromagnetism below 13 K at ambient pressure [11].…”

“…In TMTTF salt, (TMTTF) 2 AsF 6 and (TMTTF) 2 SbF 6 show charge ordered (CO) state below 100 K and 157 K, and theoretical and experimental studies have been performed from the view of the relationship between CO system and magnetism emerging at lower temperature [8][9][10]. Moreover, (TMTTF) 2 Br shows commensurate antiferromagnetism below 13 K at ambient pressure [11]. With applying pressure over 0.5 GPa, the incommensurability of the magnetic state was suggested and discussed in relation to the spin density wave (SDW) in (TMTSF) 2 PF 6 at ambient pressure [12].…”

“…On the other hand, the quasi-two dimensional organic conductor, (BEDT-TTF) 2 X shows the various electronic properties according to the molecular arrangement. In κ-(BEDT-TTF) 2 X, two BEDT-TTF molecules form a dimer, which constitutes the half-filled electronic system with the strongly-electron correlation.…”