Abstract
We have calculated bare cyclotron masses of layered organic superconductors, $\ensuremath{\kappa}$-type bis(ethylenedithio)tetrathiafulvalene (ET) and bis(ethylenedithio)tetraselenafulvalene (BETS) salts, in which the effective cyclotron masses have been determined by quantum oscillations. The higher superconducting transition temperature $({T}_{c})$ materials show the larger ratios of the observed to the bare cyclotron masses. This indicates that the mass enhancement, i.e., strong many-body effect is quite important for a high-${T}_{c}$ organic superconductor. The $\ensuremath{\kappa}$-type BETS salts need a stronger many-body interaction than the ET salts to be a superconductor, and the magnetic exchange interaction with magnetic anions realizes this requirement.
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