Electronic structure calculation and superconductivity in λ-(BETS)2GaCl4

Hirohito Aizawa, Takashi Koretsune, Kazuhiko Kuroki, Hitoshi Seo

研究成果: Article査読

8 被引用数 (Scopus)

抄録

Quasi-two-dimensional molecular conductor λ-(BETS)2GaCl4 shows superconductivity (SC) below 5.5 K, neighboring the dimer-type Mott insulating phase. To elucidate the origin of SC and its gap function, we carry out first-principles band calculation and derive a four-band tight-binding model from the maximally localized Wannier orbitals. Considering the spin-fluctuation-mediated mechanism by adding the Hubbard U-term to the model, we analyze the SC gap function by applying the random phase approximation. We show that the SC gap changes its sign four times along the Fermi surface (FS) in the unfolded Brillouin zone, suggestive of a d-wave-like SC gap, which only has two-fold symmetry because of the low symmetry of the crystal structure. By decomposing the SC gap into the pairing functions along the crystal axes, we compare the result to similar analyses of the well-studied κ-type molecular conductors and to the experiments.

本文言語English
ページ(範囲)937011-937015
ページ数5
ジャーナルjournal of the physical society of japan
87
9
DOI
出版ステータスPublished - 2018

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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