Transport, Magnetic and Optical Properties of a Quasi-Two-Dimensional Organic Metal Based on BEDO-TTF (Bis-(Ethylenedioxy) Tetrathiafulvalene)

Abstract

Polarized reflectivity spectra, tight binding band structure calculations as well as magnetoresistance and magnetization measurements have been carried out for the new quasi-two-dimensional organic conductor β″-(BEDO-TTF)5[CsHg(SCN)4]2. Polarized reflectivity and optical conductivity spectra have shown that at low temperatures this salt exhibits metallic behaviour in the direction perpendicular to the BEDO-TTF stacks, but non-metallic behaviour in the direction parallel to the stacks. It is supposed that the non-metallic behaviour is due to the dimerization of BEDO-TTF molecules in the stacks at low temperatures. Tight binding calculations suggest that the Fermi surface can be described as containing two contributions: a closed two-dimensional portion associated with holes and a open, pseudo-one-dimensional portion associated with electrons. Shubnikov-de Haas and de Haas-van Alphen oscillations have shown that some frequencies of their complicated Furie spectra are in good agreement with the calculated Fermi surface. The other frequencies of the spectra can be well understood in the frame of the quantum interference effect.KeywordsFermi SurfaceOptical ConductivityOrganic ConductorDonor LayerFast Fourier Transform SpectrumThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.