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We have studied the electronic structure of the organic conductor (DMe-DCNQI ) 2 Cu, where DMe-DCNQI is dimethyl- N , N ’ -dicyanoquinonediimine, by x-ray photoemission spectroscopy in order to elucidate the origin of the metal-insulator transitions and the anomalous magnetic properties of (DCNQI ) 2 Cu salts. The line-shape analysis of the Cu 2 p core-level spectrum shows a Cu + - Cu 2 + mixed valency; the ratio of Cu + to Cu 2 + is found to be nearly 2:1. This suggests that Cu is in a valence-fluctuating state in the metallic (DMe-DCNQI ) 2 Cu and that a Cu + - Cu 2 + charge ordering coupled with cooperative lattice distortion takes place below the metal-insulator transition temperature in other (DCNQI ) 2 Cu salts.
Physical Review B – American Physical Society (APS)
Published: Mar 15, 1992
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