Theory for Superconductivity in Iron Pnictides at Large Coulomb U Limit

Abstract

Superconductivity in iron pnictides is studied by using a two-orbital Hubbard model in the large U limit. The Coulomb repulsion induces an orbital-dependent pairing between charge carriers. The pairing is found mainly from the scattering within the same Fermi pocket. The inter-pocket pair scatterings determine the symmetry of the superconductivity, which is extended s-wave at small Hund's coupling, and d-wave at large Hund's coupling and large U. The former is consistent with recent experiments of ARPES and Andreev reflection spectroscope.

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Cited by in corpus (17)

• Iron based high transition temperature superconductors
• Pairing State with a time-reversal symmetry breaking in FeAs based superconductors
• Antiferromagnetically Driven Electronic Correlation in Iron Pnictides and Cuprates
• U(1) Slave-spin theory and its application to Mott transition in a multi-orbital model for iron pnictides
• Neutron and ARPES Constraints on the Couplings of the Multiorbital Hubbard Model for the Pnictides
• Nodes in the Gap Function of LaFePO, the Gap Function of the Fe(Se,Te) Systems, and the STM Signature of the s${}_{\pm }$ Pairing
• Antiferromagnetic Correlation and the Pairing Mechanism of the Cuprates and Iron Pnictides : a View From the Functional Renormalization Group Studies
• Band renormalization and Fermi surface reconstruction in iron-based superconductors
• $\pi$-junction to probe antiphase s-wave pairing in iron pnictide superconductors
• Distinguishing between $s+id$ and $s+is$ pairing symmetries in multiband superconductors through spontaneous magnetization pattern induced by a defect
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
• Emergent vortex Majorana zero mode in iron-based superconductors
• Possible pi-phase shift at interface of two pnictides with antiphase s-wave pairing
• Searching for Majorana quasiparticles at vortex cores in iron-based superconductors
• Suppression of $T_c$ by Zn impurity in the electron-type LaFe${}_{0.925-y}$Co${}_{0.075}$Zn${}_y$AsO system
• Spontaneous appearance of nonzero momentum Cooper pairing: Possible application to the iron-pnictides
• Orbital-transverse density-wave instabilities in iron-based superconductors