Abstract
13 C-NMR measurements have been carried out to investigate the nature of the electronic properties of the one-dimensional half-filled band system, (TTM-TTP)I 3 . It is known that this compound is metallic down to 160K. The metal-insulator transition into a non-magnetic ground state was confirmed from the temperature dependence of NMR relaxation rate. In addition, it was found that 13 C-NMR spectra split into two in the insulating state. This is a evidence of charge disproportionation among the organic molecules. It may be considered as a typical CDW formation in a 1D half-filled system with large intersite Coulomb repulsion.
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