Superconductivity in novel bismuth-sulphur superconductors has attracted large research efforts, both experimental and theoretical, but a consensus on the nature of superconductivity in these materials has yet to be reached. Using density functional theory for superconductors, we study the electron-phonon pairing mechanism in LaO0.5F0.5BiS2. We first confirm the presence of a commensurate charge density wave instability, in accordance with previous studies. Using a recently developed integration scheme for the electron-phonon coupling, we found that its strength is much lower than previously calculated, due to improved density of state calculations. We finally conclude that conventional phonon-mediated pairing cannot explain the high superconducting transition temperatures observed in this material.
@article{arxiv.1701.02909,
title = {Weak phonon-mediated pairing in BiS$_2$ superconductor from first principles},
author = {Corentin Morice and Ryosuke Akashi and Takashi Koretsune and Siddharth S. Saxena and Ryotaro Arita},
journal= {arXiv preprint arXiv:1701.02909},
year = {2017}
}