Evidence for weak electronic correlations in Fe-pnictides

Abstract

Using x-ray absorption and resonant inelastic x-ray scattering, charge dynamics at and near the Fe $L$ edges is investigated in Fe pnictide materials, and contrasted to that measured in other Fe compounds. It is shown that the XAS and RIXS spectra for 122 and 1111 Fe pnictides are each qualitatively similar to Fe metal. Cluster diagonalization, multiplet, and density-functional calculations show that Coulomb correlations are much smaller than in the cuprates, highlighting the role of Fe metallicity and strong covalency in these materials. Best agreement with experiment is obtained using Hubbard parameters $U\lesssim 2$eV and $J\approx 0.8$eV.

11 pages, 12 figures

References in corpus (24)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Correlated electronic structure of LaOFeAs
• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• The challenge of unravelling magnetic properties in LaFeAsO
• Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors
• Electronic structure of the iron-based superconductor LaOFeP
• Bandwidth and Fermi surface of Iron-Oxypnictides: covalency and sensitivity to structural changes
• Transport and anisotropy in single-crystalline SrFe${}_2$As${}_2$ and $A_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ ($A$ = Sr, Ba) superconductors
• Evidence for Strong Itinerant Spin Fluctuations in the Normal State of CeFeAsO(0.89)F(0.11) Iron-Oxypnictides
• Coulomb repulsion and correlation strength in LaFeAsO from Density Functional and Dynamical Mean-Field Theories
• Normal State Correlated Electronic Structure of Iron Pnictides
• Antiferromagnetic Correlation and the Pairing Mechanism of the Cuprates and Iron Pnictides : a View From the Functional Renormalization Group Studies
• On the electronic structure of electron doped LaOFeAs as seen by X-ray absorption spectroscopy
• Heavy anion solvation of polarity fluctuations in Pnictides
• X-ray spectra and electronic structure of FeAs superconductors
• Low-temperature lattice anomaly in LaFeAsO0.93F0.07 probed by x-ray absorption spectroscopy: Evidence for strong electron-lattice interaction
• Cu $K$-edge Resonant Inelastic X-Ray Scattering in Edge-Sharing Cuprates
• Mott State and Quantum Critical Points in Rare-Earth Oxypnictides $R{O}_{1-x}{F}_{x}FeAs$ ($R=La,Sm,Nd,Pr,Ce$)
• Coulomb Parameter U and Correlation Strength in LaFeAsO
• Correlated electrons in Fe-As compounds: a quantum chemical perspective

Cited by in corpus (108)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• Strong electronic correlations from Hund's coupling
• Selective Mottness as a key to iron superconductors
• Comparison of Ab initio Low-Energy Models for LaFePO, LaFeAsO, BaFe2As2, LiFeAs, FeSe and FeTe: Electron Correlation and Covalency
• Ironing out the details of unconventional superconductivity
• Observation of Temperature-Induced Crossover to an Orbital-Selective Mott Phase in A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Rb) Superconductors
• Orbital Order and Spontaneous Orthorhombicity in Iron Pnictides
• Three orbital model for the iron-based superconductors
• Strong electron correlations in the normal state of FeSe0.42Te0.58
• Role of multiband effects and electron-hole asymmetry in the superconductivity and normal state properties of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Orbital Ordering and Unfrustrated $(\pi ,0)$ Magnetism from Degenerate Double Exchange in the Iron Pnictides
• Unified Picture for Magnetic Correlations in Iron-Based Superconductors
• Integer and half-integer flux-quantum transitions in a niobium/iron-pnictide loop
• Unconventional electronic reconstruction in undoped (Ba,Sr)Fe${}_2$As${}_2$ across the spin density wave transition
• Electronic Structure Calculation by First Principles for Strongly Correlated Electron Systems
• Dichotomy between large local and small ordered magnetic moment in Iron-based superconductors
• Fermi-liquid, non-Fermi-liquid, and Mott phases in iron pnictides and cuprates
• Persistent high-energy spin excitations in iron pnictide superconductors
• Orbital Selectivity in Hund's metals: The Iron Chalcogenides
• Self consistent GW determination of the interaction strength: application to the iron arsenide superconductors
• Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering
• Classification of the electronic correlation strength in the Fe-pnictides: The case of the parent compound BaFe2As2
• Ab initio Evidence for Strong Correlation Associated with Mott Proximity in Iron-based Superconductors
• Charge dynamics of the Co-doped BaFe${}_2$As${}_2$
• Quantum dynamical screening of the local magnetic moment in Fe-based superconductors
• Mott Transition in Multi-Orbital Models for Iron Pnictides
• Determination of Hund's coupling in 5d Oxides using Resonant Inelastic X-ray Scattering
• Spin excitations in the excitonic spin-density-wave state of the iron pnictides
• Using RIXS to uncover elementary charge and spin excitations in correlated materials
• A study of electronic structure of FeSe${}_{1-x}$Te${}_x$ chalcogenides by Fe and Se K-edge x-ray absorption near edge structure measurements
• Synthesis, crystal structure and magnetism of beta-Fe1.00(2)Se1.00(3) single crystals
• Finite temperature spin-dynamics and phase transitions in spin-orbital models
• Identifying spin-triplet pairing in spin-orbit coupled multi-band superconductors
• LDA+DMFT approach to resonant inelastic x-ray scattering in correlated materials
• Seebeck effect in Fe1+xTe1-ySey single crystals
• Microscopically derived Ginzburg-Landau theory for magnetic order in the iron pnictides
• Electron correlation in FeSe superconductor studied by bulk-sensitive photoemission spectroscopy
• High energy pseudogap and its evolution with doping in Fe-based superconductors as revealed by optical spectroscopy
• Frustrated local moment models for Fe-pnictide magnetism
• Electronic Structure, Localization and Spin-State Transition in Cu-substituted FeSe: Fe${}_{1-x}$Cu${}_x$Se
• Sr${}_2$VO${}_3$FeAs as Compared to Other Fe-based Superconductors
• Non-Fermi Liquid due to Orbital Fluctuations in Iron Pnictide Superconductors
• Spectroscopic and thermodynamic properties in a four-band model for pnictides
• Effect of 3d-doping on the electronic structure of BaFe2As2
• Orbital order and fluctuations in the two-leg ladder materials BaFe${}_2{X}_3$ ($X$ = S and Se) and CsFe${}_2$Se${}_3$
• Itinerant Nature of Magnetism in Iron Pnictides: A first principles study
• Spin-waves in the $J_{1a}-J_{1b}-J_2$ orthorombic square-lattice Heisenberg models: Application to the iron pnictide materials
• Electronic Structure and Magnetic Properties of Half-metallic Ferrimagnet Mn${}_2$VAl Probed by Soft X-ray Spectroscopies
• Magnetic order in orbital models of the iron pnictides
• Spin-Density-Wave and Asymmetry of Coherence Peaks in iron-Pnictide Superconductors from a two-orbital model
• The magnetic moment enigma in Fe-based high temperature superconductors
• Multi-gap superconductivity in a BaFe1.84Co0.16As2 film from optical measurements at terahertz frequencies
• Charge-Stripe Order in a Parent Compound of Iron-based Superconductors
• Electronic Structure of CeFeAsO1-xFx (x=0, 0.11/x=0.12) compounds
• Strong Coupling of the Iron-Quadrupole and Anion-Dipole Polarizations in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• LDA+DMFT Spectral Functions and Effective Electron Mass Enhancement in Superconductor LaFePO
• Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe2Ge2
• Local and collective magnetism of EuFe${}_2$As${}_2$
• As-vacancies, local moments, and Pauli limiting in LaO_0.9F_0.1FeAs_(1-delta) superconductors
• Evidence for core-hole-mediated inelastic x-ray scattering from metallic Fe${}_{1.087}$Te
• Intra-layer doping effects on the high-energy magnetic correlations in NaFeAs
• Role of multiorbital effects in the magnetic phase diagram of iron-pnictides
• High-energy pseudogap in degenerate Hubbard model induced via Hund coupling
• Two-electronic component behavior in the multiband FeSe${}_{0.42}$Te${}_{0.58}$ superconductor
• The electronic instabilities of the Iron-based superconductors: a variational Monte-Carlo study
• Non-Fermi-Liquid Transport Phenomena and Superconductivity Driven by Orbital Fluctuations in Iron Pnictides: Analysis by Fluctuation-Exchange Approximation
• Orbital Symmetry of Ba(Fe1-xCox)2As2 Superconductors Probed with X-ray Absorption Spectroscopy
• Non-Fermi-Liquid-Like Behaviors and Superconductivity Driven by Orbital Fluctuations in Iron Pnictides: Analysis by Fluctuation-Exchange Approximation
• Experimental evidence for the importance of Hund's exchange interaction for the incoherence of the charge carriers in iron-based superconductors
• Magnetism and Mott Transition: A Slave-rotor Study
• Observation of a remarkable reduction of correlation effects in BaCr2As2 by ARPES
• Magnetism and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• X-ray absorption spectroscopy (XAS) investigation of the electronic structure of superconducting FeSex single crystals
• Tuning magnetism in FeAs-based materials via tetrahedral structure
• Paramagnon dispersion in $\beta$-FeSe observed by Fe $L$-edge resonant inelastic x-ray scattering
• Presence of magnetic excitations in SmFeAsO
• Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Magnetism of the Fe${}^{2+}$ and Ce${}^{3+}$ sublattices in Ce${}_2$O${}_2$FeSe${}_2$: a combined neutron powder diffraction, inelastic neutron scattering and density functional study
• Minority-Spin Impurity Band in n-Type (In,Fe)As: A Materials Perspective for Ferromagnetic Semiconductors
• Resonant inelastic x-ray scattering study of entangled spin-orbital excitations in superconducting PrFeAsO0.7
• Anisotropic magnetic excitations and incipient Néel order in Ba(Fe${}_{1-x}$Mn${}_x$)${}_2$As${}_2$
• NMR study of electronic correlations in Mn-doped Ba(Fe1-xCox)2As2 and BaFe(As1-xPx)2
• Elementary Excitations due to Orbital Degrees of Freedom in Iron Based Superconductors
• Magnetic excitations in ferro-pnictide materials controlled by a quantum critical point into hidden order
• Observation of isosceles triangular electronic structure around excess iron atoms in Fe${}_{1+\delta }$Te
• Doping dependence of antiferromagnetism in models of the pnictides
• Spin and orbital magnetic moments of Fe in the $n$-type ferromagnetic semiconductor (In,Fe)As
• Role of electric fields on enhanced electron correlation in surface-doped FeSe
• Weak and strong electronic correlations in Fe superconductors
• The electronic structure of Co-substituted $\text{Fe}\text{Se}$ superconductor probed by soft X-ray spectroscopy and density functional theory
• Effect of electron correlations on spin excitation bandwidth in Ba${}_{0.75}$K${}_{0.25}$Fe${}_2$As${}_2$ as seen via time-of-flight inelastic neutron scattering
• Pairing mechanism in Fe pnictide superconductors
• Dispersionless orbital excitations in (Li,Fe)OHFeSe superconductors
• Theoretical approach to resonant inelastic x-ray scattering in iron-based superconductors at the energy scale of the superconducting gap
• A direct probe of the variability of Coulomb correlation in Fe-pnictide superconductors
• Semimetallic spin-density wave state in iron pnictides
• Inelastic X-ray scattering from valence electrons near absorption edges of FeTe and TiSe${}_2$
• Complete renormalization group calculation up to two-loop order of an effective two-band model for iron-based superconductors
• Influence of electronic correlations on orbital polarizations in the parent and doped iron pnictides
• The role of orbital order in the stabilization of the $(\pi ,0)$ ordered magnetic state in a minimal two-band model for iron pnictides
• Spin-wave excitations in the SDW state of iron pnictides: a comparison between the roles of interaction parameters
• Electronic Structure of $\text{Fe}{\text{Se}}_{1-x}{\text{Te}}_x$ Studied by X-ray Spectroscopy and Density Functional Theory
• Spin-wave excitations in the SDW state of doped iron pnictides
• Temperature and doping dependence of normal state spectral properties in a two-orbital model for ferropnictides
• Hund's coupling and electronic anisotropy in the spin-density wave state of iron pnictides
• Orbital-lattice coupling and orbital ordering instability in iron pnictides