Two-band Fluctuation Exchange Study on the Superconductivity of $\beta'$-(BEDT-TTF)$_2$ICl$_2$ under High Pressure

TL;DR

This study investigates the pressure-dependent superconductivity of the organic compound $eta'$-(BEDT-TTF)$_2$ICl$_2$ using a two-band Hubbard model and fluctuation exchange method, revealing a d$_{xy}$-wave pairing state influenced by Fermi surface nesting and moderate dimerization.

Contribution

It applies a two-band Hubbard model with fluctuation exchange to analyze superconductivity under high pressure, highlighting the importance of moderate dimerization and realistic hopping parameters.

Findings

Superconducting transition temperature $T_c$ is obtained at realistic values.

D$_{xy}$-wave-like superconducting state is predicted.

Results are consistent with previous single band model studies.

Abstract

We study the pressure dependence of the superconducting transition temperature of an organic superconductor $\beta'$-(BEDT-TTF)$_2$ICl$_2$ by applying the fluctuation exchange method to the Hubbard model on the original two-band lattice at 3/4-filling rather than the single band model in the strong dimerization limit. Our study is motivated by the fact that hopping parameters evaluated from a first-principles study suggest that the dimerization of the BEDT-TTF molecules is not so strong especially at high pressure. Solving the linearized Eliashberg's equation, a d$_{xy}$-wave-like superconducting state with realistic values of $T_c$ is obtained in a pressure regime somewhat higher than the actual experimental result. These results are similar to those obtained within the single band model in the previous study by Kino {\it et al}. We conclude that the resemblance to the dimer limit is due to a combination of a good Fermi surface nesting, a large density of states near the Fermi level, and a moderate dimerization, which cooperatively enhance electron correlation effects and also the superconducting $T_c$.