Abstract
The de-Haas-van Alphen effect and the Fermi surface have been studied in the κ-typ organic superconductor (BEDT-TTF)2I3. The originally proposed Fermi surface using the tight-binding band calculation is different from the ones reported afterwards for the other κ-type salts. The Fermi surface has simple 2-dimensional cylindrical shape and no band gap exists at the zone boundary due to the crystal symmetry. The absence of band gap at the boundary is known as the band sticking effect. We confirmed the band sticking effect experimentally using the magnetization measurement. The observed quantum oscillation frequency corresponds to the 100% area of the first Brillouin zone. The Fourier analysis has revealed another frequency corresponding to the 20% area of the first zone other than the fundamental one. This frequency corresponds to the one reported for the other κ-type salts (BEDT-TTF)2Ag(CN)2H2O and (BEDT-TTF)2Cu(NCS)2. The effective mass of the fundamental frequency and the Dingle temperature are 2.7m0 and 0.9 K respectively. The many body renormalization effect has benn discussed considering mass enhancement and strong coupling model for the superconductor.
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