期刊
PHYSICAL REVIEW B
卷 79, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.054511
关键词
Fermi surface; fluctuations in superconductors; iron compounds; magnetic anisotropy; type II superconductors
资金
- Ames Laboratory
- U. S. Department of Energy by Iowa State University [DE-AC02-07CH11358]
We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling J(H). We find that for sufficiently large J(H), nearly commensurate magnetic fluctuations yield a fully gapped s(+/-)-pairing state with small anisotropy of the gap amplitude on each Fermi-surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi-surface sheets, as seen in angular resolved photoemission spectroscopy experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an s(+/-)-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three-dimensional effects come into play.
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