Abstract
The compound mentioned in the title is a quasi-two-dimensional organic conductor exhibits a metal–insulator transition accompanied by structural modification at T MI ∼190 K , while the tight-binding band calculation suggests a 3/4 filled band at higher temperatures. The 13 C NMR measurements have been performed on a single crystal to clarify the electronic nature of the metal–insulator transition. At room temperature, the 13 C NMR spectrum indicates that all BEDT-TTF molecules are electronically equivalent. Below T MI, however, it splits into two kinds of spectra with different Knight shifts and spin-lattice relaxation rates. These results show that charge disproportionation occurs below T MI and that long-range Coulomb interaction is important in this system.
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