Polarized Reflectance Spectra of DCNQI Salts

Abstract

Abstract Temperature dependence of the polarized reflectance spectra have been measured on the single crystals of (DMe-DCNQI)2Ag, (DMe-DCNQI)2Na, (MeBr-DCNQI)2Cu, and (DMe-DCNQI)2−Cu (DCNQI stands for dicyanoquinonediimine). The optical spectra evidence one-dimensional band structures of Ag- and Na-salts and anisotropic three-dimensional ones of Cu-salts. The dimensionality crossover is found in (MeBr-DCNQI)2Cu around the metal-insulator phase transition.