Multiband magnetism and superconductivity in Fe-based compounds

Abstract

Recent discovery of high T_c superconductivity in Fe-based compounds may have opened a new pathway to the room temperature superconductivity. The new materials feature FeAs layers instead of the signature CuO_2 planes of much-studied cuprates. A model Hamiltonian describing FeAs layers is introduced, highlighting the crucial role of puckering of As atoms in promoting d-electron itinerancy and warding off large local-moment magnetism of Fe ions, the main enemy of superconductivity. Quantum many-particle effects in charge, spin and multiband channels are explored and a nesting-induced spin density-wave order is found in the parent compund. We argue that this largely itinerant antiferromagnetism and high T_c itself are essentially tied to the multiband nature of the Fermi surface.

7 pages, 4 figures; typos corrected, updated Fig. 4, Fig. 1c added

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Cited by in corpus (57)

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• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
• Superconductivity and spin-density-waves in multi-band metals
• Superfluid density of the $\pm$s-wave state for the iron-based superconductors
• Antiferromagnetically Driven Electronic Correlation in Iron Pnictides and Cuprates
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Valley density-wave and multiband superconductivity in Fe-pnictides
• Theory of itinerant magnetic excitations in the SDW phase of iron-based superconductors
• Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
• Doping Driven ($\pi ,0$) Nesting and Magnetic Properties of Fe${}_{1+x}$Te Superconductors
• Universality of superconducting gaps in overdoped Ba0.3K0.7Fe2As2 observed by angle-resolved photoemission spectroscopy
• Narrow superconducting window in Ni-doped LaFeAsO
• Non-exponential London penetration depth in Ba${}_{1-}$K${}_x$Fe${}_2$As${}_2$ single crystals
• Control of tetrahedral coordination and superconductivity in FeSe0.5Te0.5 thin films
• Electron-Hole Asymmetry in Superconductivity of Pnictides Originated from the Observed Rigid Chemical Potential Shift
• Lower Critical Fields of Superconducting PrFeAsO${}_{1-y}$ Single Crystals
• Spin excitations in the excitonic spin-density-wave state of the iron pnictides
• A doping dependent specific heat study of the superconducting gap in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Large decrease in the critical temperature of superconducting LaFeAsO0.85 compounds doped with 3% atomic weight of nonmagnetic Zn impurities
• Enhanced Fermi surface nesting in superconducting BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ revealed by de Haas-van Alphen effect
• Measurement of a Sign-Changing Two-Gap Superconducting Phase in Electron-Doped Ba(Fe_{1-x}Co_x)_2As_2 Single Crystals using Scanning Tunneling Spectroscopy
• Effect of annealing on the specific heat of Ba(Fe1-xCox)2As2
• Tight binding model for iron pnictides
• Impurity-induced in-gap state and Tc in sign-reversing s-wave superconductors: analysis of iron oxypnictide superconductors
• Theory of Valley-Density Wave and Hidden Order in Iron-Pnictides
• Non-analytic spin susceptibility of a nested Fermi liquid: the case of Fe-based pnictides
• Single Impurity Problem in Iron-Pnictide Superconductors
• $\pi$-junction to probe antiphase s-wave pairing in iron pnictide superconductors
• Itinerant Nature of Magnetism in Iron Pnictides: A first principles study
• Effect of Zn doping on magnetic order and superconductivity in LaFeAsO
• Quantum waveguide theory of Andreev reflection in multiband superconductors: the case of Fe-pnictides
• Theory of fluctuation conductivity from interband pairing in pnictide superconductors
• Josephson effect between electron-doped and hole-doped iron pnictide single crystals
• Superconducting fluctuations in the reversible magnetization of the iron-pnictide $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$
• Magnetic order in orbital models of the iron pnictides
• Anisotropic fluctuations and quasiparticle excitations in FeSe_0.5Te_0.5
• Analysis of spin density wave conductivity spectra of iron pnictides in the framework of density functional theory
• Evidence of a universal and isotropic 2Δ/kBTC ratio in 122-type iron pnictide superconductors over a wide doping range
• Leggett mode in a strong-coupling model of iron arsenide superconductors
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
• Cooperative effects of Coulomb and electron-phonon interactions in the two-dimensional 16-band d-p model for iron-based superconductors
• Metastable $\pi$-junction between an s${}_{\pm }$-wave and an s-wave superconductor
• Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors
• Angular resolved specific heat in iron-based superconductors: the case for nodeless extended $s$-wave gap
• Non-magnetic pair-breaking effect on La(Fe_{1-x}Zn_{x})AsO_{0.85} studied by NMR and NQR
• Scaling of nascent nodes in extended s-wave superconductors
• Structural Analysis on Iron-Based Superconductor Pr1111 System with Oxygen Deficiency and Flourine Substitution
• Large $D-2$ Theory of Superconducting Fluctuations in a Magnetic Field and its Application to Iron-Pnictides
• Conventional Superconductivity in Fe-Based Pnictides: the Relevance of Intra-Band Electron-Boson Scattering
• Possible pi-phase shift at interface of two pnictides with antiphase s-wave pairing
• Quantum critical behavior driven by Hund's rule coupling in quantum antiferromagnets
• Vortex dynamics as a function of field orientation in BaFe1.9Ni0.1As2
• Importance of Itinerancy and Quantum Fluctuations for the Magnetism in Iron Pnictides
• Magnetic and Quasiparticle Excitation Spectra of an Itinerant $J_1-J_2$ Model for Iron Pnictide Superconductors
• Suppression of $T_c$ by Zn impurity in the electron-type LaFe${}_{0.925-y}$Co${}_{0.075}$Zn${}_y$AsO system
• Observation of a ubiquitous three-dimensional superconducting gap function in optimally-doped Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$