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Small-q phonon-mediated unconventional superconductivity in the iron pnictides
Department of Physics, National Technical University of Athens, Athens, Greece.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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
Abstract [en]

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.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-151651DOI: 10.1103/PhysRevB.83.092505ISI: 000288645900002OAI: oai:DiVA.org:uu-151651DiVA: diva2:411017
Available from: 2011-04-15 Created: 2011-04-15 Last updated: 2014-03-20Bibliographically approved

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