Abstract
The band filling and Fermi surface in the dual-layered organic superconductor κα2-(BEDT-TTF)2Ag(CF3)4(TCE) with a charge-ordered α-layer have been investigated, where BEDT-TTF stands for bis(ethylenedithio)tetrathiafulvalene and TCE stands for 1,1,2-trichloroethane. The de Haas–van Alphen (dHvA) oscillation indicates that the conducting layer is the κ-layer with a half-filled band; this is in agreement with the charge-ordered α-layer due to the quarter-filled band. The effective cyclotron mass observed in the dHvA oscillation is larger than the calculated bare cyclotron mass. The BEDT-TTF superconductors including a κ-layer show the following trend: the higher the superconducting transition temperature of the material, the larger the mass enhancement.
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