Anomalous optical response with variation in band filling in linear chain conductors

We report the polarized infrared reflectance of ( N -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...

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Bibliographic Details
Published in:Solid state communications 1981-01, Vol.37 (8), p.643-646
Main Authors: Weinstein, B.A., Slade, M.L., Epstein, A.J., Miller, J.S.
Format: Article
Language:English
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Summary:We report the polarized infrared reflectance of ( N -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 x ∼ 2 3 , 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.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(81)90540-8