Temperature- and pressure-dependent metallic states in (BEDT-TTF)(8)[Hg4Br12(C6H5Br)(2)]

Article

关键词: ORGANIC METAL;    MAGNETIC OSCILLATIONS;    COUPLED ORBITS;    BAND-STRUCTURE;    FERMI-SURFACE;    SPECTRUM;    CRYSTAL;    SUPERCONDUCTORS;    ELECTRON;    NETWORK;   

DOI  :  10.1103/PhysRevB.84.045101

来源: SCIE

【 摘 要 】

Temperature-driven metal-insulator and pressure-driven insulator-metal transitions observed in (BEDT-TTF)(8)[Hg4X12(C6H5Y)(2)] with X = Y = Br are studied through band-structure calculations based on x-ray crystal-structure determination and Shubnikov-de Haas (SdH) oscillation spectra, respectively. In connection with the chemical pressure effect, the transition, which is not observed for X = Cl, is due to a gap opening linked to structural changes as the temperature decreases. Even though many-body interactions can be inferred from the pressure dependence of the SdH oscillation spectra, all the data can be described within a Fermi-liquid picture.

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