Zi-Jian Yao et al 2009 New J. Phys. 11 025009 doi:10.1088/1367-2630/11/2/025009
Spin fluctuations, interband coupling and unconventional pairing in iron-based superconductors
Focus on Iron-Based SuperconductorsZi-Jian Yao1,2, Jian-Xin Li1,2,3 and Z D Wang1,3
Show affiliationsPart of Focus on Iron-Based Superconductors
Based on an effective two-band model and using the fluctuation-exchange (FLEX) approach, we explore spin fluctuations and unconventional superconducting pairing in Fe-based layer superconductors. It is elaborated that one type of interband antiferromagnetic (AF) spin fluctuation stems from the interband Coulomb repulsion, whereas the other type of intraband AF spin fluctuation originates from the intraband Coulomb repulsion. Due to the Fermi-surface topology, a spin-singlet extended s-wave superconducting state is more favorable than the nodal dXY-wave state if the interband AF spin fluctuation is more significant than the intraband one, otherwise vice versa. It is also revealed that the effective interband coupling plays an important role in the intraband pairings, which is a distinct feature of the present two-band system.
- This article was modified on 2 March 2009 to include J X Li as a corresponding author.
- PACS
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71.18.+y Fermi surface: calculations and measurements; effective mass, g factor
- Subjects
- Dates
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Issue 2 (February 2009)
Received 12 November 2008
Published 27 February 2009
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Spin fluctuations, interband coupling and unconventional pairing in iron-based superconductors
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