Abstract
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 SrTiO$_3$ 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.
Highlights
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
Ever since the discovery of superconductivity in monolayer FeSe on SrTiO3 substrate (FeSe/STO) [1] no consensus has yet been reached about such fundamental questions as, for example, the Cooper pairing mechanism or the superconducting gap symmetry, despite tremendous research effort in both theory and experiment [2]
Our results reveal that the most plausible Brillouin zone (BZ) symmetry of the superconducting gap is nodeless d wave, while an anisotropic s-wave
Summary
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. In this Rapid Communication, we study the competition/ cooperation between SFs and EPI in the superconducting state of FeSe/STO. Left with two parameters U and g0, which respectively control the strength of CFs/SFs and EPI, we solve the full-bandwidth, multiband, and anisotropic Eliashberg equations (see Appendix) for each pair (U, g0).
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