Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling

Abstract

A new class of high temperature superconductors based on iron and arsenic was recently discovered, with superconducting transition temperature as high as 55 K. Here we show, using microscopic theory, that the normal state of the iron pnictides at high temperatures is highly anomalous, displaying a Curie Weiss susceptibility and a linear temperature dependence of the resistivity. Below a coherence scale T*, the resistivity sharply drops and susceptibility crosses over to Pauli-like temperature dependence. Remarkably, the coherence-incoherence crossover temperature is a very strong function of the strength of the Hund's rule coupling J_Hund. On the basis of the normal state properties, we estimate J_Hund to be 0.35-0.4 eV. In the atomic limit, this value of J_Hund leads to the critical ratio of the exchange constants J_1/J_2~2. While normal state incoherence is in common to all strongly correlated superconductors, the mechanism for emergence of the incoherent state in iron-oxypnictides, is unique due to its multiorbital electronic structure.

arXiv comment4 pages, 3 figures

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• Competition of three-dimensional magnetic phases in Ca${}_2$Ru${}_{1-x}$Fe${}_x$O${}_4$: A structural perspective
• Strong-coupling expansion of multi-band interacting models: mapping onto the transverse-field $J_1$-$J_2$ Ising model
• Universal quasi-degenerate orbital origin of two-dome phases in iron pnictide superconductors
• Unconventional superconducting gap via spin fluctuations in iron-vacancy ordered A${}_y$Fe${}_{2-x}$Se${}_2$
• Hund's metal regimes and orbital selective Mott transitions in three band systems
• Multi-orbital two-particle self-consistent approach -- strengths and limitations
• Anisotropic two-orbital Hubbard model: single-site versus cluster dynamical mean-field theory
• Clean realization of the Hund physics near the Mott transition: $\mathrm{Ni}{\mathrm{S}}_2$ under pressure
• Ultrafast orbital manipulation and Mott physics in multi-band correlated materials
• Van Hove singularities, chemical pressure and phonons: an angle-resolved photoemission study of KFe${}_2$As${}_2$ and CsFe${}_2$As${}_2$
• The Hund's Superconductor Li(Fe,Co)As
• Hole doping and electronic correlations in Cr-substituted BaFe${}_2$As${}_2$
• Hidden Kondo lattice physics in single-orbital Hubbard models
• Electronic Structure of $\text{Fe}{\text{Se}}_{1-x}{\text{Te}}_x$ Studied by X-ray Spectroscopy and Density Functional Theory
• Crystalline anisotropy induces a second antiferromagnetic phase in the absence of SDW in the heavily hydrogen-doped LaFeAsO${}_{1-x}$H${}_x$ $(x\sim 0.5)$
• Many-body effects on the resistivity of a multiorbital system beyond Landau's Fermi-liquid theory
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
• Low-energy, planar magnetic defects in BaFe2As2: nanotwins, twins, antiphase and domain boundaries
• Orbital driven two-dome superconducting phases in multiorbital superconductors
• Observation of Two Cascading Screening Processes in an Iron-based Superconductor
• Triplet pairing, orbital selectivity and correlations in Iron-based superconductors
• Improved estimator for numerical renormalization group calculations of the self-energy
• Evidence for valence-bond pairing in a one-dimensional two-orbital system
• Superconductor-Insulator transition in a two-orbital attractive Hubbard model with Hund's exchange
• Stripes and Pairing in High Temperature Superconductors
• Local-moment magnetism in Mn-based pnictides
• Multi-band D-TRILEX approach to materials with strong electronic correlations
• Many-body electronic structure, self-doped double-exchange, and Hund metallicity in 1T-CrTe2 bulk and monolayer
• Hund's metallicity enhanced by van Hove singularity in cubic perovskite systems