CC BY 4.0 UnportedCho, Dai-Ningvan den Brink, JeroenFehske, HolgerBecker, Klaus W.Sykora, Steffen2018-07-242019-06-282016https://doi.org/10.34657/5036https://oa.tib.eu/renate/handle/123456789/1544We study the competition between unconventional superconducting pairing and charge density wave (CDW) formation for the two-dimensional Edwards Hamiltonian at half filling, a very general two-dimensional transport model in which fermionic charge carriers couple to a correlated background medium. Using the projective renormalization method we find that a strong renormalization of the original fermionic band causes a new hole-like Fermi surface to emerge near the center of the Brillouin zone, before it eventually gives rise to the formation of a charge density wave. On the new, disconnected parts of the Fermi surface superconductivity is induced with a sign-changing order parameter. We discuss these findings in the light of recent experiments on iron-based oxypnictide superconductors.application/pdfenghttps://creativecommons.org/licenses/by/4.0/620Applied mathematicsSuperconducting properties and materialsArticle