Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 77, Issue 12, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.123701
Keywords
iron-based superconductors; 16-band d-p model; pairing symmetry; RPA; Hund's coupling
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Funding
- Ministry of Education, Culture, Sports, Science and Technology
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The electronic states of the Fe2As2 plane in iron-based superconductors are investigated oil the basis of the two-dimensional 16-band d-p model Which includes file Coulomb interaction oil a Fe site: the intra-and inter-orbital direct terms U and U', the Hand'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 d(xy)-wave for small J.
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