Abstract
The electronic states of the Fe2As2 plane in iron-based superconductors are investigated on the basis of the two-dimensional 16-band d-p model which includes the Coulomb interaction on a Fe site: the intra-and inter-orbital direct terms U and U′, the Hund's coupling J and the pair-transfer J′. Using the random phase approximation (RPA), we obtain the magnetic phase diagram including the stripe and the incommensurate order on the U′-J plane. We also solve the superconducting gap equation within the RPA and find that, for large J, the most favorable pairing symmetry is extended s-wave whose order parameter changes its sign between the hole pockets and the electron pockets, while it is dxy-wave for small J.
Original language | English |
---|---|
Article number | 123701 |
Journal | journal of the physical society of japan |
Volume | 77 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2008 Dec |
Externally published | Yes |
Keywords
- 16-band d-p model
- Hund's coupling
- Iron-based superconductors
- Pairing symmetry
- RPA
ASJC Scopus subject areas
- Physics and Astronomy(all)