Modeling Antiferromagnetic Phase in Iron Pnictides: Weakly Ordered State

Abstract

We examine electronic states of antiferromagnetic phase in iron pnictides by mean-field calculations of the optical conductivity. We find that a five-band model exhibiting a small magnetic moment, inconsistent with the first-principles calculations, reproduces well the excitation spectra characterized by a multi-peak structure emerging below the Néel temperature at low energy, together with an almost temperature-independent structure at high energy. Investigating the interlayer magnetoresistance for this model, we also predict its characteristic field dependence reflecting the Fermi surface.

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• Conductivity anisotropy in the antiferromagnetic state of iron pnictides
• Magnetic interactions in iron superconductors: A review
• Low magnetization and anisotropy in the antiferromagnetic state of undoped iron pnictides
• Orbital-weight redistribution triggered by spin order in the pnictides
• Spin and Charge Dynamics Ruled by Antiferromagnetic Order in Iron Pnictides
• Optical conductivity and Raman scattering of iron superconductors
• Transfer of optical spectral weight in magnetically ordered superconductors
• Origin of In-Plane Anisotropy in Optical Conductivity for Antiferromagnetic Metallic Phase of Iron Pnictides
• Magnetic order in orbital models of the iron pnictides
• Origin of electronic dimers in the spin-density wave phase of Fe-based superconductors
• Spin-state Crossover Model for the Magnetism of Iron Pnictides
• A General Mechanism for Orbital Selective Phase Transitions
• Spin-Density-Wave Gap with Dirac Nodes and Two-Magnon Raman Scattering in BaFe2As2
• Optical Conductivity Anisotropy in the Undoped Three-Orbital Hubbard Model for the Pnictides
• Effective Hamiltonian for transition-metal compounds. Application to Na_xCoO_2
• The double life of electrons in magnetic iron pnictides, as revealed by NMR
• Effect of covalency and interactions on the trigonal splitting in NaxCoO2
• Doping dependence of antiferromagnetism in models of the pnictides
• Orbital Selective Phase Transition
• Importance of Itinerancy and Quantum Fluctuations for the Magnetism in Iron Pnictides
• Magnetism and Superconductivity in Iron-based Superconductors Decided by Condensed Particle-hole Excitations away from the Fermi Level