Frontiers of Organic Superconductors

Development of Conductive Organic Molecular Assemblies: Organic Metals, Superconductors, and Exotic Functional Materials

“…As a consequence, ''an expanded anion that forms a thin anion layer'' has been proposed as an appropriate anion-design strategy. 2,518 The substantial reduction of T c in -(ET) 2 MHg(SCN) 4 also suggests the importance of the interlayer interactions (t 0 ? ) through an anion opening.…”

“…17 The activation energy eventually goes to zero at 27.0 GPa for a single crystal. Besides aromatic hydrocarbons, compounds having a large %-moiety, such as Pc, 18 and compounds having heavy atoms at the peripheral positions such as tetraselenonaphthacene(tetracene) (naphthaceno [5,6-c,d:11,12-c 0 ,d 0 ]-bis [1,2]diselenole) (TSeN or TSeT, 5), [19][20][21][22] p-iodanil (tetraiodo-p-benzoquinone) (6) 23-25 and BTQBT (12) 26,27 have been investigated since the 70s by Shirotani and Inokuchi et al Under hydrostatic pressure, these compounds show a rapid decrease in resistivity and become good conductors. For example, p-iodanil is an insulator (' RT ¼ 1 Â 10 À12 S cm À1 ) at ambient pressure and becomes conductive under pressure (' RT ¼ 2 Â 10 S cm À1 at 25 GPa).…”

“…These four salts are classified into two groups according to the crystal symmetry: namely monoclinic P2 1 for X = Cu-(NCS) 2 There are two crystallographically independent ET molecules in the P2 1 symmetry salts, while there is only one in the Pnma symmetry salts. Reflecting the crystal symmetry, the calculated Fermi surfaces of the P2 1 salts showed the certain energy gap between a 1D electron-like Fermi surface and a 2D cylindrical hole-like one (-orbit) (Fig.…”

“…In order to suppress the thermal contraction, the use of ''a structurally 2D anion layer that is able to provide short anionÁÁÁdonor contacts'' would be effective. 2,518 Since the V anion has a large ambiguity due to the complicated polymerized anions, a V mes2 value, which corresponds to the sum of the space for C 6 S 8 skeletons of ET and the intra-donorlayer overlap space between them per two carriers, was proposed by Yamochi et al 442 Figure 51 includes only the ambient-pressure superconductors of various phases. Except for…”

“…Our research interests [1][2][3][4][5][6][7][8][9][10] have straddled a number of conductive and magnetic organic assemblies including organic metals, superconductors, spin-ladders, spin-liquid, etc. (Fig.…”