Quantum Monte Carlo Study of a Dominant s-Wave Pairing Symmetry in Iron-Based Superconductors
Tianxing Ma, Hai-Qing Lin, Jiangping Hu
DOI 10.1103/PhysRevLett.110.107002 · Physical Review Letters
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Abstract
We perform a systematic quantum Monte Carlo study of the pairing correlation in the S4 symmetric microscopic model for iron-based superconductors. It is found that the pairing with an extensive s-wave symmetry robustly dominates over other pairings at low temperature in a reasonable parameter region regardless of the change of Fermi surface topologies. The pairing susceptibility, the effective pairing interaction, and the (π, 0) antiferromagnetic correlation strongly increase as the on-site Coulomb interaction increases, indicating the importance of the effect of electron-electron correlation. Our nonbiased numerical results provide a unified understanding of the superconducting mechanism in iron pnictides and iron chalcogenides and demonstrate that the superconductivity is driven by strong electron-electron correlation effects.
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