Conduction-electron spin resonance in Langmuir-Blodgett films of a charge-transfer complex

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Abstract
Electron-spin-resonance measurements were performed on the newly developed conducting Langmuir-Blodgett films consisting of a charge-transfer complex of bis(ethylenedioxy)tetrathiafulvalene (BO) and decyltetracyanoquinodimethane. The temperature-dependent spin susceptibility and linewidth clearly indicate that the major region of the films has a metallic nature. The density of states has been estimated as 3.5 states/eV per BO molecule, assuming no electron correlation. No metal-insulator transition has been detected at least down to 50 K, while an anomaly seen in the linewidth around 140 K suggests a certain kind of structural transition.