Reflectivity spectra of new organic metal (BEDO-TTF)(5)[CsHg( SCN)(4)](2)

The polarized reflectivity and optical conductivity spectra of microcrystal s of the new organic conductor (BEDO-TTF)(5)[CsHg(SCN)(4)](2) based on the donor molecule bis(ethylenedioxy)tetrathiafulvalene (BEDO-TTF) have been st udied in the spectral ranges 600-6500 and 9000-40000 cm(-1) at 300 K for th ree principal lattice directions. The optical evidence for the quasi-two-di mensional character of the conducting electronic system is obtained. The co nclusion is made that the studied crystal is the quasi-two-dimensional semi metal with overlapping electron energy bands. The basic parameters of the e lectronic system of the crystal are determined in the framework of the Drud e model. It is found that the allowed electron energy bands of the crystal are somewhat narrower than those of the previously studied structurally all ied superconductor based on the same molecule. The features of vibrational structure are identified in the sigma(omega) spectra for the specified thre e polarizations. (C) 2000 MAIK "Nauka/Interperiodica".