Pnictides as frustrated quantum antiferromagnet close to a quantum phase transition

Abstract

We present a detailed description of the dynamics of the magnetic modes in the recently discovered superconducting pnictides using reliable self-consistent spin-wave theory and series expansion. Contrary to linear spin-wave theory, no gapless mode occurs at the Néel wave vector. We discuss the scenario that the static magnetic moment is strongly reduced by magnetic fluctuations arising from the vicinity to a quantum phase transition. Smoking gun experiments to verify this scenario are proposed and possible results are predicted. Intriguingly in this scenario, the structural transition at finite temperature would be driven by an Ising transition in directional degrees of freedom.

5 pages, 4 figures, to appear in Phys. Rev. B

References in corpus (26)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• 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
• Origin of the ~150 K Anomaly in LaOFeAs; Competing Antiferromagnetic Superexchange Interactions, Frustration, and Structural Phase Transition
• Correlated electronic structure of LaOFeAs
• A minimal two-band model for the superconducting Fe-pnictides
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Nematic order in square lattice frustrated ferromagnets
• Theory of magnetic excitations in iron-based layered superconductors
• Electron-Hole Symmetry and Magnetic Coupling in Antiferromagnetic LaOFeAs
• Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study
• Origin of the spin density wave instability in AFe${}_2$As${}_2$ (A=Ba, Sr) as revealed by optical spectroscopy
• Proximity of antiferromagnetism and superconductivity in LaO${}_{1-x}$F${}_x$FeAs: effective Hamiltonian from ab initio studies
• Antiferromagnetic superexchange interactions in LaOFeAs
• Iron-based layered superconductor LaO${}_{1-x}$F${}_x$FeAs: an antiferromagnetic semimetal
• Magnetic and structural transitions in layered FeAs systems: AFe2As2 versus RFeAsO compounds
• Low energy spin waves and magnetic interactions in SrFe${}_2$As${}_2$
• Theory of the Magnetic Moment in Iron Pnictides
• High energy spin excitations in BaFe2As2
• Ising transition driven by frustration in a 2D classical model with SU(2) symmetry
• Anisotropic three-dimensional magnetism in CaFe2As2
• Magnetic Excitations in the High Tc Iron Pnictides
• A closer look at symmetry breaking in the collinear phase of the $J_1-J_2$ Heisenberg Model
• Ising transition in the two-dimensional quantum $J_1-J_2$ Heisenberg model

Cited by in corpus (43)

• Orbital Ordering and Unfrustrated $(\pi ,0)$ Magnetism from Degenerate Double Exchange in the Iron Pnictides
• Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2
• Magnetic degeneracy and hidden metallicity of the spin density wave state in ferropnictides
• U(1) Slave-spin theory and its application to Mott transition in a multi-orbital model for iron pnictides
• Spin excitations in the excitonic spin-density-wave state of the iron pnictides
• Finite temperature spin-dynamics and phase transitions in spin-orbital models
• Microscopically derived Ginzburg-Landau theory for magnetic order in the iron pnictides
• Quantum magnetism on the Cairo pentagonal lattice
• Spin Dynamics of a J1-J2-K Model for the Paramagnetic Phase of Iron Pnictides
• Frustrated local moment models for Fe-pnictide magnetism
• Self-consistent spin-wave theory for a frustrated Heisenberg model with biquadratic exchange in the columnar phase and its application to iron pnictides
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Spin-waves in the $J_{1a}-J_{1b}-J_2$ orthorombic square-lattice Heisenberg models: Application to the iron pnictide materials
• Magnetic order in orbital models of the iron pnictides
• Pseudo-Goldstone magnons in the frustrated S=3/2 Heisenberg helimagnet ZnCr2Se4 with a pyrochlore magnetic sublattice
• Spin Dynamics of a $J_1-J_2$ Antiferromagnet and its Implications for Iron Pnictides
• Spin-state Crossover Model for the Magnetism of Iron Pnictides
• Self-energy effects and electron-phonon coupling in Fe-As superconductors
• Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2
• Three dimensional generalization of the $J_1$-$J_2$ Heisenberg model on a square lattice and role of the interlayer coupling $J_c$
• Effects of ring exchange interaction on the Neel phase of two-dimensional, spatially anisotropic, frustrated Heisenberg quantum antiferromagnet
• Orbital-dependent effects of electron correlations in microscopic models for iron-based superconductors
• Ordered moment in the anisotropic and frustrated square lattice Heisenberg model
• Spin and quadrupolar orders in the spin-1 bilinear-biquadratic model for iron-based superconductors
• Role of Degeneracy, Hybridization, and Nesting in the Properties of Multi-Orbital Systems
• Ground state selection by magnon interactions in the fcc antiferromagnet
• Effective Exchange Interactions for Bad Metals and Implications for Iron-based Superconductors
• Magnetic correlations and pairing in the 1/5-depleted square lattice Hubbard model
• Magnetic phase diagram of spatially anisotropic, frustrated spin-1/2 Heisenberg antiferromagnet on a stacked square lattice
• Antiferromagnetism in Iron-Based Superconductors: Selection of Magnetic Order and Quasiparticle Interference
• Spectrum splitting of bimagnon excitations in a spatially frustrated Heisenberg antiferromagnet revealed by resonant inelastic x-ray scattering
• Ising-nematic order in the bilinear-biquadratic model for the iron pnictides
• The double life of electrons in magnetic iron pnictides, as revealed by NMR
• Continuous similarity transformation for critical phenomena: easy-axis antiferromagnetic XXZ model
• Magnon-phonon coupling effects on the indirect K-edge resonant inelastic X-ray scattering spectrum of a 2D Heisenberg antiferromagnet
• Electron Correlation and Spin Dynamics in Iron Pnictides and Chalcogenides
• Revealing the degree of magnetic frustration by non-magnetic impurities
• A Frustrated 3-Dimensional Antiferromagnet: Stacked $J_1-J_2$ Layers
• Spin-wave energy dispersion of a frustrated spin-1/2 Heisenberg antiferromagnet on a stacked square lattice
• Anisotropic magnetic excitations of a frustrated bilinear-biquadratic spin model -- Implications for spin waves of detwinned iron pnictides
• Quantum melting of long-range ordered quantum antiferromagnets investigated by momentum-space continuous similarity transformations
• Effective field theories and spin-wave excitations in helical magnets
• Superconducting states of a J1-J2-K model for iron pnictides