2020/09/18 by Fabian Schrodi, Alex Aperis, Peter M. Oppeneer +1 · 16 citations
Materials Science · Physics and Astronomy · #Anisotropy #Condensed matter physics #Cooper pair #Coupling (piping) #Iron-based superconductors research #Materials science #Pairing #Phonon #Physics #Physics of Superconductivity and Magnetism #Point reflection #Quantum mechanics #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.102.180501
published in Physical review. B./Physical review. B 102(18) (American Physical Society)
arxiv created 2020/09/18 · openalex created_date 2020/09/25 · openalex publication_date 2020/11/04 · arxiv updated 2020/11/11 · openalex updated_date 2026/08/05
We investigate the effects of electron-phonon coupling, as well as of spin and charge fluctuations on the superconducting state in a single layer of FeSe on SrTiO3 substrate. These three bosonic mediators of Cooper pairing are treated on equal footing in a multichannel, full-bandwidth, multiband, and anisotropic Eliashberg theory of the interacting state. Our self-consistent calculations show that an s-wave symmetry of the superconducting gap is compatible only with a complete absence of spin fluctuations. When spin fluctuations are present, the sign-changing nodeless d-wave pairing symmetry is always obtained, yet the essential ingredient for explaining the gap magnitude and critical temperature is still the interfacial electron-phonon interaction.