Anomalous optical response with variation in band filling in linear chain conductors |
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Authors: | B.A. Weinstein M.L. Slade A.J. Epstein J.S. Miller |
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Affiliation: | Xerox Webster Research Center, Rochester, New York 14644, USA;Occidental Research Corporation, Irvine, California 92713, USA |
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Abstract: | We report the polarized infrared reflectance of (-methylphenazinium)x (phenazine)1-x(tetracyanoquinodimethanide), (NMP)x(Phen)1-x(TCNQ) for 0.5≤x≤1.0. We demonstrate that the “Drude edge” in TCNQ salts is related to the conduction electron charge density. An anomalous rapid red shift of the plasma frequency, observed for , may signal the emptying of the conduction electrons from half of the chains and/or a crossover from small U/W (coulomb repulsion/bandwidth) to large U/W behavior. |
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