Multiband magnetism and superconductivity in Fe-based compounds
arXiv:0804.4678 · doi:10.1209/0295-5075/85/37002
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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- Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
- Antiferromagnetically Driven Electronic Correlation in Iron Pnictides and Cuprates
- Valley density-wave and multiband superconductivity in Fe-pnictides
- Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
- Doping Driven () Nesting and Magnetic Properties of FeTe Superconductors
- Narrow superconducting window in Ni-doped LaFeAsO
- Non-exponential London penetration depth in BaKFeAs single crystals
- Lower Critical Fields of Superconducting PrFeAsO Single Crystals
- Tight binding model for iron pnictides
- Non-analytic spin susceptibility of a nested Fermi liquid: the case of Fe-based pnictides
- 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
- Vortex state in iron-based superconductors with collinear antiferromagnetic cores
- Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors
- Quantum critical behavior driven by Hund's rule coupling in quantum antiferromagnets