Magnetoelectrodynamics of a three-dimensional organic conductor: Observation of cyclotron resonance in d2

Abstract

We have used an amplitude- and phase-sensitive millimeter-wave technique, in combination with a resonant cavity configuration, to observe cyclotron resonance in the three-dimensional organic conductor ${\mathit{d}}_{2}$[1,1;0]-(DMe-DCNQI${)}_{2}$Cu. The data obtained in this way are simple to analyze and serve as an extremely clear illustration of the electrodynamic response of an organic conductor in a high magnetic field. A cyclotron resonance mass of (3.35\ifmmode\pm\else\textpm\fi{}0.2)${\mathit{m}}_{\mathit{e}}$ is obtained, in agreement with the effective mass deduced from de Haas--van Alphen measurements. This result suggests that Coulomb correlations between the three-dimensional charge carriers in this material are not important and that the large effective mass is simply a result of the hybridization between a narrow Cu 3d band and the p\ensuremath{\pi} band due to the DMe-DCNQI molecules. \textcopyright{} 1996 The American Physical Society.