Nov, 2016
Hole-s(+/-) State Induced by Coexisting Ferro- and Antiferromagnetic and Antiferro-orbital Fluctuations in Iron Pnictides
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
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- Volume
- 85
- Number
- 11
- First page
- 114709-1
- Last page
- 114709-8
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.7566/JPSJ.85.114709
- Publisher
- PHYSICAL SOC JAPAN
The five-orbital Hubbard model for iron- based superconductors is investigated using the dynamical mean-field theory combined with the Eliashberg equation to clarify the local correlation effects on the electronic states and the superconductivity. In the specific case where the antiferromagnetic (AFM) and antiferro-orbital (AFO) fluctuations are comparably enhanced, the orbital dependence of the vertex function is significantly large, while that of the self-energy is small, in contrast to the AFM fluctuation-dominated case where the vertex function (the self-energy) shows a small (large) orbital dependence. The orbital-dependent vertex function together with the nesting between the inner and outer hole Fermi surfaces results in the enhancement of the inter-orbital ferromagnetic (FM) fluctuation in addition to the AFM and AFO fluctuations. In this case, the hole-s(+/-)-wave pairing with the sign change of the two hole Fermi surfaces is mediated by the coexisting three fluctuations as expected to be observed in the specific compound LiFeAs.
- Link information
- ID information
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- DOI : 10.7566/JPSJ.85.114709
- ISSN : 0031-9015
- Web of Science ID : WOS:000386430100021