Abstract
Abstract An x-ray photoemisson study of (DMe-DCNQI) 2 Cu is reported. The line-shape analysis reveals the mixed valency of Cu + and Cu 2+ , and the Cu 2+ : Cu 2+ ratio is found to be ∼ 2 : 1. This suggest that Cu is in a valance fluctuating state in the metallic state and, in other (DCNQI) 2 Cu compounds, a Cu + Cu 2+ charge-ordering takes place below the metal-insulator transition temperature.
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