Volume 99, Number 5, September 2012
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||13 September 2012|
Pairing symmetry in the iron-pnictide superconductor KFe2As2
1 Department of Physics and State Key Laboratory of Surface Physics, Fudan University - Shanghai 200433, China
2 Texas Center for Superconductivity and Department of Physics, University of Houston - Houston, TX 77204, USA
3 Theoretical Division, Los Alamos National Laboratory - Los Alamos, NM 87545, USA
Received: 27 June 2012
Accepted: 8 August 2012
The pairing symmetry is one of the major issues in the study of iron-based superconductors. We adopt a ten-orbital model by using the maximally localized Wannier functions based on the first-principles band structure calculations combined with the J1-J2 model for KFe2As2, the phase diagram of pairing symmetries is constructed. We find that the pairing symmetry for KFe2As2 is a nodal (sx2y2 + sx2+y2)-wave in the folded Brillouin zone with two iron atoms per unit cell. This pairing symmetry can explain the experiments observed nodes, and it also can be tested by future experiments.
PACS: 74.70.Xa – Pnictides and chalcogenides / 74.20.Rp – Pairing symmetries (other than s-wave) / 74.25.Jb – Electronic structure (photoemission, etc.)
© EPLA, 2012
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