Phys. Rev. Lett. 102, 047005 (2009) [4 pages]Functional Renormalization-Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs-Based High-Temperature SuperconductorReceived 11 July 2008; published 29 January 2009 We apply the fermion functional renormalization-group method to determine the pairing symmetry and pairing mechanism of the FeAs-Based materials. Within a five band model with pure repulsive interactions, we find an electronic-driven superconducting pairing instability. For the doping and interaction parameters we have examined, extended s wave, whose order parameter takes on opposite sign on the electron and hole pockets, is always the most favorable pairing symmetry. The pairing mechanism is the inter-Fermi-surface Josephson scattering generated by the antiferromagnetic correlation. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.047005
DOI:
10.1103/PhysRevLett.102.047005
PACS:
74.20.Mn, 74.20.Rp, 74.25.Jb, 74.72.Jt
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