Small-q Phonon Mediated Unconventional Superconductivity in the Iron Pnictides

Details Small-q Phonon Mediated Unconventional Superconductivity in the Iron Pnictides Small-q Phonon Mediated Unconventional Superconductivity in the Iron Pnictides

2009-11-09

arxiv.org/abs/0911.1461v3

Physical Review B 83, 092505 (2011)

Physics

Condensed Matter

Superconductivity

Final version. Corrected typos. Reference added

Scientific paper

10.1103/PhysRevB.83.092505

We report self-consistent calculations of the gap symmetry for the 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 $s_\pm$ state that was first encountered in a spin-fluctuations mechanism picture. Nodal gap structures such as $d_{x^2-y^2}$ and $s_\pm+d_{x^2-y^2}$ 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 non-phononic mechanism and isotope effect measurements proving the involvement of phonons in the pairing.

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