Ferro-Orbital Order and Strong Magnetic Anisotropy in the Parent Compounds of Iron-Pnictide Superconductors

Abstract

The puzzling nature of magnetic and lattice phase transitions of iron pnictides is investigated via a first-principles Wannier function analysis of representative parent compound LaOFeAs. A rare ferro-orbital ordering is found to give rise to the recently observed highly anisotropic magnetic coupling, and drive the phase transitions--without resorting to widely employed frustration or nesting picture. The revealed necessity of the additional orbital physics leads to a correlated electronic structure fundamentally distinct from that of the cuprates. In particular, the strong coupling to the magnons advocates active roles of light orbitons in spin dynamics and electron pairing in iron pnictides.

accepted by Physical Review Letters

References in corpus (23)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
• Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs
• Theory of Electron Nematic Order in LaOFeAs
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Origin of the ~150 K Anomaly in LaOFeAs; Competing Antiferromagnetic Superexchange Interactions, Frustration, and Structural Phase Transition
• A minimal two-band model for the superconducting Fe-pnictides
• Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
• Spin Waves and Magnetic Exchange Interactions in CaFe2As2
• The challenge of unravelling magnetic properties in LaFeAsO
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors
• Electron-Hole Symmetry and Magnetic Coupling in Antiferromagnetic LaOFeAs
• Proximity of antiferromagnetism and superconductivity in LaO${}_{1-x}$F${}_x$FeAs: effective Hamiltonian from ab initio studies
• Iron-based layered superconductor LaO${}_{1-x}$F${}_x$FeAs: an antiferromagnetic semimetal
• Field and Temperature Dependence of the Superfluid Density in LaO_{1-x}F_xFeAs Superconductors: A Muon Spin Relaxation Study
• Anisotropy, Itineracy, and Magnetic Frustration in High-Tc Iron Pnictides
• Properties of a two orbital model for oxypnictide superconductors: Magnetic order, B_2g spin-singlet pairing channel, and its nodal structure
• Doping evoluton of antiferromagnetic order and structural distortion in LaFeAsO${}_{1-x}$F${}_x$
• Interplay between magnetic properties and Fermi surface nesting in iron pnictides
• Effective Hamiltonian for FeAs based superconductors
• Effect of the tetrahedral distortion on the electronic properties of iron-pnictides

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• Spin and quadrupolar orders in the spin-1 bilinear-biquadratic model for iron-based superconductors
• Pairing insights in iron-based superconductors from scanning tunneling microscopy
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• Origin of doping-induced suppression and reemergence of magnetism in LaFeAsO${}_{1-x}$H${}_x$
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• Electron-phonon interaction in Fe-based superconductors: Coupling of magnetic moments with phonons in LaFeAsO${}_{1-x}$F${}_x$
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• Momentum-resolved measurement of electronic nematic susceptibility in the FeSe${}_{0.9}$S${}_{0.1}$ superconductor
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• First-Order Reversal Curves of the Magnetostructural Phase Transition in FeTe
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• Brief review on iron-based superconductors: are there clues for unconventional superconductivity?
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• Quadrupolar charge dynamics in the nonmagnetic FeSe${}_{1-x}$S${}_x$ superconductors
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• Anomalous spectral weight transfer in the nematic state of iron-selenide superconductor
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• Study of antiferromagnetic and nematic phase transitions in $BaF{e}_2(A{s}_{1-x}{P}_x{)}_2$ by AC micro-calorimetry and SQUID magnetometry
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• Role of Fermi surface for the pressure-tuned nematic transition in the BaFe${}_2$As${}_2$ family
• Proposal to determine the Fermi-surface topology of a doped iron-based superconductor using bulk-sensitive Fourier-transform Compton scattering
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• Orbital Resonance Mode in Superconducting Iron Pnictides
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• Direct observation of spin excitation anisotropy in the paramagnetic orthorhombic state of BaFe${}_{2-x}$Ni${}_x$As${}_2$
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• Itinerant scenario for Fe-pnictides: comparison with quantum Monte Carlo
• Electronic origin of structural transition in 122 Fe based superconductors
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• Strain-induced spin-nematic state and nematic susceptibility arising from $2\times 2$ Fe clusters in KFe${}_{0.8}$Ag${}_{1.2}$Te${}_2$
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• Unconventional non-Fermi liquid state caused by nematic criticality in cuprates
• Vibrational anomalies in AFe${}_2$As${}_2$ (A$=$Ca, Sr, and Ba) single crystals
• High impact of spin-nematic order on the lattice domains in thin films of iron-based superconductors
• Three-dimensional bond-order instability in infinite-layer nickelates due to nonlocal quantum interference
• Nematic fluctuations in the non-superconducting iron pnictide BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Orbital order from the on-site orbital attraction
• Uniaxial stress effect on the electronic structure of quantum materials
• Phase transitions in a frustrated biquadratic Heisenberg model with coupled orbital degree of freedom for iron-based superconductors
• Surface orbital order and chemical potential inhomogeneity of the iron-based superconductor FeTe0.55Se0.45 investigated with special STM tips
• Electronic structure, spin excitations, and orbital ordering in a three-orbital model for iron pnictides
• Stronger quantum fluctuation with larger spins: Emergent magnetism in the pressurized high-temperature superconductor FeSe
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Observation of the novel type of ordering: Spontaneous ferriquadrupolar order
• Gap-like feature in the normal state of $\mathbf{X}(\mathbf{F}{\mathbf{e}}_{1-\mathbf{x}}\mathbf{C}{\mathbf{o}}_{\mathbf{x}}{)}_2\mathbf{A}{\mathbf{s}}_2$, $\mathbf{X}=\mathbf{Ba},\mathbf{Sr}$ and $\mathbf{F}{\mathbf{e}}_{1+\mathbf{y}}\mathbf{Te}$ revealed by Point Contact Spectroscopy
• Temperature dependent As K-edge EXAFS studies of LaFe1-xCoxAsO (x = 0.0 and 0.11) single crystals
• Mapping out the spin fluctuations in Co-doped LaFeAsO single crystals by NMR
• Surface Nematic Order in Iron Pnictides
• Influence of orbital nematic order on spin responses in Fe-based superconductors
• The role of orbital order in the stabilization of the $(\pi ,0)$ ordered magnetic state in a minimal two-band model for iron pnictides
• Universal quasi-degenerate orbital origin of two-dome phases in iron pnictide superconductors
• The driving mechanism of the d-wave orbital order in the iron-based superconductors
• Orbital-transverse density-wave instabilities in iron-based superconductors
• Magnetic softness in iron-based superconductors
• The influence of the structural transition on magnetic fluctuations in NaFeAs
• Electronically driven nematicity in FeSe Films on SrTiO3
• Suppression of nematicity by tensile strain in multilayer FeSe/SrTiO${}_3$ films
• The mechanism of anisotropic exchange interaction in superconducting iron arsenides
• Crystalline anisotropy induces a second antiferromagnetic phase in the absence of SDW in the heavily hydrogen-doped LaFeAsO${}_{1-x}$H${}_x$ $(x\sim 0.5)$
• Interplay of iron and rare-earth magnetic order in rare-earth iron pnictide superconductors under magnetic field
• Atomic-scale imaging of electronic nematicity in ferropnictides
• Anisotropic Electronic Mobilities in the Nematic State of the Parent Phase NaFeAs
• Orbital Order in Two-orbital Hubbard Model
• Magnetic form factor analysis on detwinned single crystal of BaFe${}_2$As${}_2$
• Detecting the orbital character of the spin fluctuation in the Iron-based superconductors with the resonant inelastic X-ray scattering spectroscopy
• Orbital-lattice coupling and orbital ordering instability in iron pnictides
• Pomeranchuk instability in the nematic phase of two monolayer FeSe/SrTiO3
• Hund's coupling and electronic anisotropy in the spin-density wave state of iron pnictides