{"paper":{"title":"Electron - phonon coupling in Eliashberg - McMillan theory beyond adiabatic approximation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"M.V. Sadovskii","submitted_at":"2018-09-07T15:19:42Z","abstract_excerpt":"Eliashberg - McMillan theory of superconductivity is essentially based on the adiabatic approximation. Small parameter of perturbation theory is given by $\\lambda\\frac{\\Omega_0}{E_F}\\ll 1$, where $\\lambda$ is the dimensionless electron - phonon coupling constant, $\\Omega_0$ is characteristic phonon frequency, while $E_F$ is Fermi energy of electrons. Here we present an attempt to describe electron - phonon interaction within Eliashberg - McMillan approach in situation, when characteristic phonon frequency $\\Omega_0$ becomes large enough (comparable or exceeding the Fermi energy $E_F$). We cons"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.02531","kind":"arxiv","version":2},"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"}