Small-q phonon-mediated unconventional superconductivity in the iron pnictides
2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 83, no 9, 092505- p.Article in journal (Refereed) Published
We report self-consistent calculations of the gap symmetry for iron-based high-temperature superconductors using realistic small-q phonon-mediated pairing potentials and four-band energy dispersions. When both electron and hole Fermi surface pockets are present, we obtain the nodeless s± state that was first encountered in a spin-fluctuation mechanism picture. Nodal s± as well as other gap structures such as dx2−y2, s±+dx2−y2, and even a p-wave triplet state, are accessible upon doping within our phononic mechanism. Our results resolve the conflict between phase-sensitive experiments reporting a gap changing sign, attributed previously only to a nonphononic mechanism, and isotope effect measurements proving the involvement of phonons in the pairing.
Place, publisher, year, edition, pages
2011. Vol. 83, no 9, 092505- p.
IdentifiersURN: urn:nbn:se:uu:diva-151651DOI: 10.1103/PhysRevB.83.092505ISI: 000288645900002OAI: oai:DiVA.org:uu-151651DiVA: diva2:411017