Multiband magnetism and superconductivity in Fe-based compoundsV. Cvetkovic and Z. Tesanovic
Department of Physics and Astronomy, The Johns Hopkins University - Baltimore, MD 21218, USA
received 12 November 2008; accepted in final form 18 January 2009; published February 2009
published online 13 February 2009
Recent discovery of superconductivity in Fe-based layered compounds may have opened a new pathway to the room temperature superconductivity. 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 Tc itself are essentially tied to the multiband nature of the Fermi surface.
74.20.-z - Theories and models of superconducting state.
75.30.Fv - Spin-density waves.
71.45.Lr - Charge-density-wave systems.
© EPLA 2009