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We study the pressure dependence of the superconducting transitiontemperature of an organic superconductor $\beta'$-(BEDT-TTF)$_2$ICl$_2$ byapplying the fluctuation exchange method to the Hubbard model on the originaltwo-band lattice at 3/4-filling rather than the single band model in the strongdimerization limit. Our study is motivated by the fact that hopping parametersevaluated from a first-principles study suggest that the dimerization of theBEDT-TTF molecules is not so strong especially at high pressure. Solving thelinearized Eliashberg's equation, a d$_{xy}$-wave-like superconducting statewith realistic values of $T_c$ is obtained in a pressure regime somewhat higherthan the actual experimental result. These results are similar to thoseobtained within the single band model in the previous study by Kino {\it etal}. We conclude that the resemblance to the dimer limit is due to acombination of a good Fermi surface nesting, a large density of states near theFermi level, and a moderate dimerization, which cooperatively enhance electroncorrelation effects and also the superconducting $T_c$.Comment: 6 pages, 8 figure

Two-Band Fluctuation Exchange Study on Superconductivity of β'-(BEDT-TTF)2ICl2under High Pressure

Two-Band Fluctuation Exchange Study on Superconductivity of β'-(BEDT-TTF)₂ICl₂under High Pressure