Multiband magnetism and superconductivity in Fe-based compounds

Details Multiband magnetism and superconductivity in Fe-based compounds Multiband magnetism and superconductivity in Fe-based compounds

2008-04-29

arxiv.org/abs/0804.4678v4

Europhysics Letters 85, 37002 (2009)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1209/0295-5075/85/37002

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.

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