On the dual role of the d-electrons in iron-pnictides

Abstract

In the stoichiometric Fe-pnictides the same d-electrons form the local moments and participate in the metallic conductivity. In the manuscript the emergence of the magnetic moments on the Fe-sites, their interaction with the itinerant electrons are studied in the paramagnetic phase at the different relations between the onsite Coulomb repulsion and the intraatomic Hund's exchange. The energy of the local center that is due to its interaction with the conduction electrons is calculated exactly. It is found that the spin density wave transition is controlled by the RKKY interactions between the centers rather than by the nesting mechanism. In the paramagnetic phase the electrons scatter on the randomly oriented moments. The calculated inverse mean free time provides the interpretation for few available experimental data on the conductivity. The multi-band structure of the energy spectrum in iron pnictides is taken into account.

16 pages

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Cited by in corpus (12)

• Strong Correlations, Strong Coupling and s-wave Superconductivity in Hole-doped BaFe2As2 Single Crystals
• Normal state spin dynamics in the iron-pnictide superconductors BaFe2(As1-xPx)2 and Ba(Fe1-xCox)2As2 probed with NMR measurements
• Nematicity driven by hybridization in iron-based superconductors
• Local magnetic moment formation and Kondo screening in the half filled two dimensional single band Hubbard model
• Highly mobile carriers in orthorhombic phases of iron-based superconductors FeSe${}_{1-x}$S${}_x$
• Fermi-surface topology of the iron pnictide LaFe${}_2$P${}_2$
• Strong similarities between the local electronic structure of insulating iron pnictide and lightly doped cuprate
• Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and 75As-NMR/NQR
• Hidden Order as a Source of Interface Superconductivity
• High-Energy Damping by Particle-Hole Excitations in the Spin-Wave Spectrum of Iron-Based Superconductors
• Two-Fluid Description for Iron-Based Superconductors
• Coupled multiple-mode theory for $s_{\pm }$ pairing mechanism in iron based superconductors