We present a systematic study for understanding the relation between electronic correlation and superconductivity in C 60 and aromatic compounds. We derived, from first principles, extended Hubbard models for twelve compounds: fcc K 3C 60, Rb 3C 60, Cs 3C 60 (with three different lattice constants), A15 Cs 3C 60 (with four different lattice constants), doped solid picene, coronene, and phenanthrene. We show that these compounds are strongly correlated and have similar energy scales of their bandwidths and interaction parameters. However, they have a different trend in the relation between the strength of the electronic correlation and superconducting- transition temperature. While the C 60 compounds have a positive correlation, the aromatic compounds exhibit a negative correlation.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2012 4月 25|
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