Small-q phonon-mediated unconventional superconductivity in the iron pnictides

This item is provided by the institution :
National Technical University of Athens

Repository :
Digital Library of National Technical University of Athens | Dspace@NTUA

see the original item page
in the repository's web site and access all digital files if the item^*

Title

Small-q phonon-mediated unconventional superconductivity in the iron pnictides (EN)

Creator

Oppeneer, PM (EN)

Varelogiannis, G (EN)

Aperis, A (EN)

Kotetes, P (EN)

Type

journalArticle (EN)

Partial document
Publication in journal (EN)

Article
Scientific article (EN)

Issued

2014-03-01T01:37:06Z

2011 (EN)

Year

2011 (EN)

Description

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. © 2011 American Physical Society. (EN)

Scientific field

Physics, Condensed Matter (EN)

Natural Sciences ▶ Physical sciences
Condensed Matter Physics (EN)

Subject

TEMPERATURE (EN)

BA0.6K0.4FE2AS2 (EN)

GAP (EN)

YBA2CU3O7 (EN)

SYSTEMS (EN)

DEPENDENCE (EN)

Journal

Physical Review B - Condensed Matter and Materials Physics (EN)