Minimal two-band model of the superconducting iron oxypnictides

2008/04/07 by S. Raghu, Xiao‐Liang Qi, Xiao-Liang Qi +5 · 17 citations
Materials Science · Physics and Astronomy · #Brillouin zone #Condensed matter physics #Cuprate #Electron #Electronic band structure #Fermi energy #Fermi level #Fermi surface #Iron-based superconductors research #Physics #Pnictogen #Pseudogap #Quantum mechanics #Superconductivity #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.77.220503

published as Phys.Rev.B 77 220503(R) (2008) · 5 figures, 5 pages

arxiv created 2008/04/07 · openalex publication_date 2008/06/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Following the discovery of the Fe-pnictide superconductors, local-density approximation (LDA) band structure calculations showed that the dominant contributions to the spectral weight near the Fermi energy came from the Fe 3d orbitals. The Fermi surface is characterized by two hole surfaces around the \ensuremathΓ point and two electron surfaces around the M point of the two Fe/cell Brillouin zone. Here, we describe a two-band model that reproduces the topology of the LDA Fermi surface and exhibits both ferromagnetic and q=(\ensuremathπ,0) spin-density wave fluctuations. We argue that this minimal model contains the essential low energy physics of these materials.

Citations

• Superconductivity at 25 K in hole-doped (La 1-x Sr x )OFeAs
• A generic two-band model for unconventional superconductivity and spin-density-wave order in electron- and hole-doped iron-based superconductors
• Unscreened Hartree-Fock calculations for metallic Fe, Co, Ni, and Cu fromab initioHamiltonians

Cited by

• Effect of Zn doping on magnetic order and superconductivity in LaFeAsO
• Optical properties of the iron arsenic superconductorBaFe1.85Co0.15As2
• Andreev bound states in iron pnictide superconductors
• Doping evolution of itinerant magnetic fluctuations in Fe-based pnictides
• A simple mechanism for unconventional superconductivity in a repulsive fermion model
• Temperature-Dependent s± ↔ s++ Transitions in the Multiband Model for Fe-Based Superconductors with Impurities
• Multiple phase transitions in Pauli-limited iron-based superconductors
• Pairing enhanced by local orbital fluctuations in a model for monolayer FeSe
• Orbital nematic order and interplay with magnetism in the two-orbital Hubbard model
• Spectral analysis for the iron-based superconductors: Anisotropic spin fluctuations and fully gappeds±-wave superconductivity
• Experimental study of the intrinsic multiple Andreev reflections effect in GdO(F)FeAs superconductor array junctions
• Green's-function theory of dirty two-band superconductivity
• Bogoliubov Fermi surfaces in spin-12 systems: Model Hamiltonians and experimental consequences
• A twisted ladder: relating the Fe superconductors to the high-Tccuprates
• Normal-state correlated electronic structure of iron pnictides from first principles
• Effects of single- and multi-substituted Zn ions in doped 122-type iron-based superconductors
• Possible nematic spin liquid in spin-1 antiferromagnetic system on the square lattice: Implications for the nematic paramagnetic state of FeSe

Related

• A generic two-band model for unconventional superconductivity and spin-density-wave order in electron- and hole-doped iron-based superconductors
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Superconducting Properties of Two-Orbital t-t'-J-J' Models
• Orbital order, spin waves, and doping effects in the (π,0) SDW state --- comparative study of the three band models for iron pnictides
• Evidence of spin density wave in LaFeAsO, the parent material of the new Fe-based oxypnictide superconductors