2008/04/03 by Tao Li · 2 citations
Materials Science · Physics and Astronomy · #Antiferromagnetism #Crystal (programming language) #Degeneracy (biology) #Field (mathematics) #Ground state #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Microscopic theory #Physics of Superconductivity and Magnetism #Plane (geometry) #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-8984/20/42/425203
4 pages, 3 figures
arxiv created 2008/04/03 · openalex publication_date 2008/09/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A microscopic model for the FeAs plane in the newly discovered iron-based superconductors is proposed with the emphasis on the role of the orbital degeneracy between the Fe 3d xz and 3d yz orbitals in the crystal field environment. The model predicts that the Fe 3d xz and 3d yz orbitals have the largest itinerancy among the five Fe 3d orbitals as a result of their hybridization with the As 4p orbital. The covalence with the As 4p orbital also explains naturally the large geometric frustration which is necessary for the formation of the magnetic order with a wavevector at (π,0) as found in experiments. An extended s-wave pairing is proposed for the superconducting state based on symmetry considerations and the local magnetic correlation pattern.