Abstract
The electronic states of the FeAs plane in iron-based superconductors are investigated on the basis of the two-dimensional 16-band d–p model, where the tight-binding parameters are determined so as to fit the band structure obtained by the density functional calculation for LaFeAsO. The model includes the Coulomb interaction on a Fe site: the intra- and inter-orbital direct terms U and U ', the exchange coupling J and the pair-transfer J '. Within the random phase approximation (RPA), we discuss the pairing symmetry of possible superconducting states including s -wave and d -wave pairing on the U '– J plane.
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