Volume 85, Number 3, February 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||13 February 2009|
Multiband magnetism and superconductivity in Fe-based compounds
Department of Physics and Astronomy, The Johns Hopkins University - Baltimore, MD 21218, USA
Corresponding author: email@example.com
Accepted: 18 January 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.
PACS: 74.20.-z – Theories and models of superconducting state / 75.30.Fv – Spin-density waves / 71.45.Lr – Charge-density-wave systems
© EPLA, 2009
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