Microscopic origin of magnetism and magnetic interactions in ferropnictides

Abstract

One year after their initial discovery, two schools of thought have crystallized regarding the electronic structure and magnetic properties of ferropnictide systems. One postulates that these are itinerant weakly correlated metallic systems that become magnetic by virtue of spin-Peierls type transition due to near-nesting between the hole and the electron Fermi surface pockets. The other argues these materials are strongly or at least moderately correlated, the electrons are considerably localized and close to a Mott-Hubbard transition, with the local magnetic moments interacting via short-range superexchange. In this paper we argue that neither picture is fully correct. The systems are moderately correlated, but with correlations driven by Hund's rule coupling rather than by the on-site Hubbard repulsion. The iron moments are largely local, driven by Hund's intra-atomic exchange. Superexchange is not operative and the interactions between the Fe moments are considerably long-range and driven mostly by one-electron energies of all occupied states.

References in corpus (13)

• Fermi surface nesting and the origin of Charge Density Waves in metals
• Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs
• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
• The challenge of unravelling magnetic properties in LaFeAsO
• Strong coupling between magnetic and structural order parameters in SrFe2As2
• 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
• Interplay between magnetic properties and Fermi surface nesting in iron pnictides
• On the electronic structure of electron doped LaOFeAs as seen by X-ray absorption spectroscopy
• X-ray spectra and electronic structure of FeAs superconductors
• Strength of correlations in pnictides and its assessment by theoretical calculations and spectroscopy experiments
• Role of covalent Fe-As bonding in the magnetic moment formation and exchange mechanisms in iron-pnictide superconductors
• Pseudogap Value in the Energy Spectrum of LaOFeAs: Fixed Spin Moment Treatment

Cited by in corpus (109)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• Gap symmetry and structure of Fe-based superconductors
• Strong electronic correlations from Hund's coupling
• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• Selective Mottness as a key to iron superconductors
• Janus-faced influence of the Hund's rule coupling in strongly correlated materials
• Magnetism in Fe-based superconductors
• Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system
• In-plane electronic anisotropy of underdoped "122" Fe-arsenide superconductors revealed by measurements of detwinned single crystals
• Orbital Order and Spontaneous Orthorhombicity in Iron Pnictides
• Magnetic degeneracy and hidden metallicity of the spin density wave state in ferropnictides
• Superconductivity and spin-density-waves in multi-band metals
• Atomic coexistence of superconductivity and incommensurate magnetic order in the Ba(Fe1-xCox)2As2 pnictide
• Chalcogen-height dependent magnetic interactions and magnetic order switching in FeSe${}_x$Te${}_{1-x}$
• Low-energy microscopic models for iron-based superconductors: a review
• Unconventional electronic reconstruction in undoped (Ba,Sr)Fe${}_2$As${}_2$ across the spin density wave transition
• Revealing the dual nature of magnetism in iron pnictides and iron chalcogenides using x-ray emission spectroscopy
• Double-Q spin-density wave in iron arsenide superconductors
• Fractional power-law behavior and its origin in iron-chalcogenide and ruthenate superconductors: Insights from first-principles calculations
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Anisotropic charge dynamics in detwinned Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Effects of magnetism and doping on the electron-phonon coupling in BaFe${}_2$As${}_2$
• Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe(1+x)Te(1-y)Se(y)
• Interplay between magnetism and superconductivity in iron-chalcogenide superconductors: crystal growth and characterizations
• Distinct electronic nematicities between electron and hole underdoped iron pnictides
• Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
• Unconventional temperature enhanced magnetism in iron telluride
• Dispersive Spin Fluctuations in the near optimally-doped superconductor Ba(Fe1-xCox)2As2 ($x$=0.065)
• Fermi surface dichotomy of the superconducting gap and pseudogap in underdoped pnictides
• Kinetic Magnetism and Orbital Order in Iron Telluride
• Magnetic interactions in iron superconductors: A review
• Phonon anomaly in BaFe2As2
• Determination of Hund's coupling in 5d Oxides using Resonant Inelastic X-ray Scattering
• Superconductivity, Antiferromagnetism, and Neutron Scattering
• Magnetic ordering in mackinawite (tetragonal FeS): evidence for strong itinerant spin fluctuations
• Short-range incommensurate magnetic order near the superconducting phase boundary in Fe(1+d)Te(1-x)Se(x)
• Hall effect measurements on epitaxial SmNiO3 thin films and implications for antiferromagnetism
• Vestigial chiral and charge orders from bidirectional spin-density waves: Application to the iron-based superconductors
• Suppression of superconductivity by Neel-type magnetic fluctuations in the iron pnictides
• Spin reorientation driven by the interplay between spin-orbit coupling and Hund's rule coupling in iron pnictides
• Effect of tensile stress on the in-plane resistivity anisotropy in BaFe2As2
• Anisotropic but nodeless superconducting gap in the presence of spin density wave in iron-pnictide superconductor NaFe1-xCoxAs
• High energy pseudogap and its evolution with doping in Fe-based superconductors as revealed by optical spectroscopy
• Fermi surface reconstruction in FeSe under high pressure
• Magnetic order without tetragonal-symmetry-breaking in iron arsenides: microscopic mechanism and spin-wave spectrum
• Phonon softening near structural transition in BaFe2As2 observed by inelastic x-ray scattering
• Electronic correlations in iron-pnictide superconductors and beyond; what can we learn from optics
• Effect of doping and pressure on magnetism and lattice structure of Fe-based superconductors
• Quasiparticle interference in iron-based superconductors
• Magnetic and superconducting instabilities in a hybrid model of itinerant/localized electrons for iron pnictides
• Itinerant Nature of Magnetism in Iron Pnictides: A first principles study
• Upper critical field and thermally activated flux flow in single crystalline Tl${}_{0.58}$Rb${}_{0.42}$Fe${}_{1.72}$Se${}_2$
• Coexistence between superconducting and spin density wave states in iron-based superconductors: Ginzburg-Landau analysis
• What is the minimal model of magnetic interactions in Fe-based superconductors?
• Angle-resolved photoemission study of the role of nesting and orbital orderings in the antiferromagnetic phase of BaFe2As2
• Anisotropic in-plane optical conductivity in detwinned Ba(Fe1-xCox)2As2
• Magnetism in parent Fe-chalcogenides: quantum fluctuations select a plaquette order
• Structural origin of the anomalous temperature dependence of the local magnetic moments in the CaFe${}_2$As${}_2$ family of materials
• The magnetic moment enigma in Fe-based high temperature superconductors
• High-resolution angle-resolved photoemission spectroscopy study of the electronic structure of EuFe2As2
• Disorder-driven electronic localization and phase separation in superconducting Fe1+yTe0.5Se0.5 single crystals
• Electronic correlations in the van der Waals ferromagnet Fe${}_3$GeTe${}_2$ revealed by its charge dynamics
• Bulk electronic structure of optimally doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Nature of the bad metallic behavior of Fe_{1.06}Te inferred from its evolution in the magnetic state
• Quantm Magnetoresistance of the PrFeAsO oxypnictides
• Fermi surface with Dirac fermions in CaFeAsF determined via quantum oscillation measurements
• Spin excitations in the nematic phase and the metallic stripe spin-density wave phase of iron pnictides
• Interplane resistivity of underdoped single crystals (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$, $0\le x<0.34$
• High-energy pseudogap in degenerate Hubbard model induced via Hund coupling
• Magnetic interactions in iron superconductors studied with a five-orbital model within the Hartree-Fock and Heisenberg approximations
• Spin-Density-Wave Gap with Dirac Nodes and Two-Magnon Raman Scattering in BaFe2As2
• On the dual role of the d-electrons in iron-pnictides
• ThFeAsN in Relation to Other Iron-Based Superconductors
• Manipulating surface magnetic order in iron telluride
• Impact of local-moment fluctuations on the magnetic degeneracy of iron arsenide superconductors
• Crystal Symmetry and Magnetic Order in Iron Pnictides: a Tight Binding Wannier Function Analysis
• Auxiliary Field Quantum Monte Carlo for Multiband Hubbard Models: Controlling the Sign and Phase Problems to Capture Hund's Physics
• Theoretical Investigation of Optical Conductivity in Ba [Fe(1-x)Co(x)]2 As2
• A view from inside iron-based superconductors
• Optical study on the spin-density wave properties in single crystalline Na${}_{1-\delta }$FeAs
• Tuning magnetism in FeAs-based materials via tetrahedral structure
• Nanoscale textured superconductivity in Ru-substituted BaFe2As2 : a challenge to a universal phase diagram for the pnictides
• Collective magnetic excitations of $C_4$ symmetric magnetic states in iron-based superconductors
• Enhanced low-energy magnetic excitations via suppression of the itinerancy in Fe0.98-zCuzTe0.5Se0.5
• Common origin of the two types of magnetic fluctuations in iron chalcogenides
• Low Energy, Coherent, Stoner-like Excitations in CaFe${}_2$As${}_2$
• Magnetic order tuned by Cu substitution in Fe1.1-zCuzTe
• Magnetic phase transitions and superconductivity in strained FeTe
• Quasiparticle interference in antiferromagnetic parent compounds of Fe-based superconductors
• Collective spin mode in a multi-component system of coupled itinerant and localized electrons
• Brief review on iron-based superconductors: are there clues for unconventional superconductivity?
• Temperature-induced Change in the Fermi Surface Topology in the Spin Density Wave Phase of Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Anisotropic quasiparticle coherence in nematic BaFe${}_2$As${}_2$ studied with strain-dependent ARPES
• Anomalous frequency and temperature dependent scattering and Hund's coupling in the almost quantum critical heavy fermion system CeFe${}_2$Ge${}_2$
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Antiphase magnetic boundaries in iron-based superconductors: A first-principle density-functional theory study
• Revealing the degree of magnetic frustration by non-magnetic impurities
• Magneto-Transport Properties of Single Crystalline LaFeAsO
• Theoretical study on the anisotropic electronic structure of antiferromagnetic BaFe${}_2$As${}_2$ and Co-doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ seen by angle-resolved photoemission
• Optical Study of BaFe${}_2$As${}_2$ under pressure: Coexistence of spin-density-wave gap and superconductivity
• Evidence for proximity of YFe${}_2$Si${}_2$ to a magnetic quantum critical point
• Electronic structure of ruthenium-doped iron chalcogenides
• Breakdown of the Hund's Rule in CuFeAs
• Electronic Structure of $\text{Fe}{\text{Se}}_{1-x}{\text{Te}}_x$ Studied by X-ray Spectroscopy and Density Functional Theory
• The mechanism of anisotropic exchange interaction in superconducting iron arsenides
• Magnetism and Superconductivity in Iron-based Superconductors Decided by Condensed Particle-hole Excitations away from the Fermi Level