Problems of design of ET based organic metals and superconductors with mercury containig anions

Temperature- and pressure-dependent metallic states in(BEDT−TTF)8[Hg4<

“…4. Their mean dimensions were 0.1 × 0.1 × 0.02 mm 3 for x-ray diffraction experiments and 0.5 × 0.5 × 0.02 mm 3 for magnetoresistance measurements.…”

“…4 Nevertheless, a metallic ground state is recovered for (Br, Br) under an applied pressure of 0.4 GPa, and Shubnikov-de Haas (SdH) oscillations have been observed at 0.8 GPa in fields below 15 T. 11 Their frequency (F = 215 T) is close to that linked to the closed orbits a of the compounds with X = Cl, i.e., with a metallic ground state at ambient pressure. This could suggest that the pressure-induced metallic state in (Br, Br) is similar to the ambient pressure ground state of (Cl, Cl) and (Cl, Br) and offers the possibility to study the applied pressure-induced evolution of the ground state.…”

“…Even though a metallic ground state is observed for both (Cl, Cl) and (Cl, Br), i.e., X = Cl, a metal-insulator transition is reported as the temperature is lowered for X = Br. 4 Band-structure calculations yield a Fermi surface (FS) composed of one electron and one hole compensated quasi-two-dimensional orbits for both (Cl, Cl) (Ref. 5) and (Cl, Br) (Ref.…”

Different Types of Electron-Vibrational Interaction in BEDT-TTF Salts with Halide-Mercurate Anions Studied by IR Spectroscopy

“…The synthesis of the studied crystals is described elsewhere [3][4][5][6][7][8]. We measured the polarized reflectivity in the region of 300-5000 cm -1 for single crystals from the crystal plain containing conducting sheets of ET molecules.…”

“…Salts of ET with halide-mercurate anions form a wide class of organic conductors with a variety of electrical properties (from dielectrics to superconductors) [3][4][5][6][7][8][9]. In this paper we present the results of the study of optical properties of a large family of such salts.…”