{"paper":{"title":"Electronic Structure Calculation and Superconductivity in $\\lambda$-(BETS)$_{2}$GaCl$_{4}$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Hirohito Aizawa, Hitoshi Seo, Kazuhiko Kuroki, Takashi Koretsune","submitted_at":"2018-07-01T23:35:37Z","abstract_excerpt":"Quasi-two-dimensional molecular conductor $\\lambda$-(BETS)$_2$GaCl$_4$ shows superconductivity (SC) below 5.5K, 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 ("},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.00416","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}