Abstract
Abstract The Fermi surfaces in the κ-type organic superconductors have been studied using Shubnikov de Haas (SdH) and de Haas van Alphen(dHvA) effect. The systematic change in the superconducting transition temperature among the κ-phase superconductors are discussed in relation to the contribution of anion layers to the transport properties. The dHvA effect in κ-(BEDT-TTF)2Ag(CN)2H2O show a similar but characteristic quantum oscillation compared with that of κ-(BEDT-TTF)2Cu(NCS)2. We could obtain no oscillation in κ-(BEDT-TTF)2Cu[(NCN)2]Br which has the highest Tc so far observed at ambient pressure.
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