Magnetic and superconducting instabilities in a hybrid model of itinerant/localized electrons for iron pnictides

Abstract

We study a unified mechanism for spin-density-wave (SDW) and superconductivity in a minimal model, in which itinerant electrons and local moments coexist as previously proposed for the iron pnictides [EPL, 88, 17010 (2009)]. The phase diagram obtained at the mean field level is in qualitative agreement with the experiment, which shows how the magnetic and superconducting (SC) instabilities are driven by the critial coupling between the itinerant/localized electrons. The spin and charge response functions at the random phase approximation (RPA) level further characterize the dynamical evolution of the system. In particular, the dynamic spin susceptibility displays a Goldstone mode in the SDW phase, which evolves into a gapped resonance-like mode in the superconducting phase. The latter persists all the way into the normal state above Tc, where a strong scattering between the itinerant electrons and local moments is restored, as an essential feature of the model.

11 pages, 8 figures

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• Observation of Temperature-Induced Crossover to an Orbital-Selective Mott Phase in A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Rb) Superconductors
• High energy pseudogap and its evolution with doping in Fe-based superconductors as revealed by optical spectroscopy
• Observation of Superconductivity Induced Ferromagnetism in an Fe-Chalcogenide Superconductor
• Amperean Pairing at the Surface of Topological Insulators
• Evolution from unconventional spin density wave to superconductivity and a novel gap-like phase in NaFe1-xCoxAs
• Nematicity driven by hybridization in iron-based superconductors
• The magnetic moment enigma in Fe-based high temperature superconductors
• Spin-Orbital-Intertwined Nematic State in FeSe
• Phase diagram and a possible unified description of intercalated iron selenide superconductors
• A General Mechanism for Orbital Selective Phase Transitions
• On the dual role of the d-electrons in iron-pnictides
• Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and 75As-NMR/NQR
• Transitions from a Kondo-like diamagnetic insulator into a modulated ferromagnetic metal in ${\mathrm{FeGa}}_{3-\mathbf{y}}{\mathrm{Ge}}_{\mathbf{y}}$
• Can Orbital-Selective Néel Transitions Survive Strong Nonlocal Electronic Correlations?
• High-Energy Damping by Particle-Hole Excitations in the Spin-Wave Spectrum of Iron-Based Superconductors
• Two-Fluid Description for Iron-Based Superconductors
• Coexistence of localized and itinerant magnetism in intercalated iron-selenide (Li,Fe)OHFeSe
• Competing effective interactions of Dirac electrons in the Spin-Fermion system
• Breakdown of the Hund's Rule in CuFeAs
• Calculation of generalized spin stiffness constant of strongly correlated doped quantum antiferromagnet on two-dimensional lattice and it's application to effective exchange constant for semi-itinerant systems
• Longitudinal modes of spin fluctuations in iron-based superconductors