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

Alain Audouard (1) , Fabienne Duc (1) , David Vignolles (1) , Rustem B. Lyubovskii (2) , Laure Vendier (3) , Gena V. Shilov (2) , Elena I. Zhilayeva (2) , Rimma N. Lyubovskaya (2) , Enric Canadell (4)

1 LNCMI-T - Laboratoire national des champs magnétiques intenses - Toulouse
2 IPCP - Institute of Problems of Chemical Physics
3 LCC - Laboratoire de chimie de coordination
4 ICMAB - Institut de Ciència de Materials de Barcelona

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) oscillations spectra, respectively. In connection with chemical pressure effect, the transition, which is not observed for X = Cl, is due to 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 oscillations spectra, all the data can be described within a Fermi liquid picture.

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Alain Audouard, Fabienne Duc, David Vignolles, Rustem B. Lyubovskii, Laure Vendier, et al.. Temperature- and pressure-dependent metallic states in (BEDT-TTF)8[Hg4Br12(C6H5Br)2]. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 84 (4), pp.045101. ⟨10.1103/PhysRevB.84.045101⟩. ⟨hal-00595071⟩