Possible origin of the reduced magnetic moment in iron pnictides: A dynamical mean field theory study

Abstract

We investigate the phase diagram of a two-band frustrated Hubbard model in the framework of dynamical mean field theory. While a first-order phase transition occurs from a paramagnetic (PM) metal to an antiferromagnetic (AF) insulator when both bands are equally frustrated, an intermediate AF metallic phase appears in each band at different $U_c$ values if only one of the two bands is frustrated, resulting in continuous orbital-selective phase transitions from PM metal to AF metal and AF metal to AF insulator. We argue that such intermediate phases are possibly related to the puzzling AF metallic state with small magnetization observed in undoped iron-pnictide superconductors as well as to the pseudogap features observed in optical experiments.

4 pages, 5 figures, accepted in Phys. Rev. B(RC)

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• Mott Transition in Multi-Orbital Models for Iron Pnictides
• Orbital selective Fermi surface shifts and mechanism of high T${}_c$ superconductivity in correlated AFeAs (A=Li,Na)
• Self-consistent spin-wave theory for a frustrated Heisenberg model with biquadratic exchange in the columnar phase and its application to iron pnictides
• Magnetic and superconducting instabilities in a hybrid model of itinerant/localized electrons for iron pnictides
• Analysis of spin density wave conductivity spectra of iron pnictides in the framework of density functional theory
• Dynamical cluster approximation within an augmented plane-wave framework: Spectral properties of SrVO${}_3$
• QSGW+DMFT: an electronic structure scheme for the iron pnictides and beyond
• A General Mechanism for Orbital Selective Phase Transitions
• Pseudogap-like phase in Ca(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ revealed by ${}^{75}$As NQR
• Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors
• Collective spin mode in a multi-component system of coupled itinerant and localized electrons
• Orbital selective phase transition induced by different magnetic states: A dynamical cluster approximation study
• Can Orbital-Selective Néel Transitions Survive Strong Nonlocal Electronic Correlations?
• Orbital Selective Mott Transition Induced by Orbitals with Distinct Noninteracting Densities of States
• Importance of Itinerancy and Quantum Fluctuations for the Magnetism in Iron Pnictides
• Orbital Selective Phase Transition
• Uncovering double-stripe and plaquette antiferromagnetic states in the one-band Hubbard model on a frustrated square lattice