期刊
PHYSICAL REVIEW B
卷 79, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.224510
关键词
Fermi surface; iron compounds; renormalisation; RPA calculations; spin fluctuations
资金
- Oak Ridge National Laboratory's Center for Nanophase Materials Sciences and the Scientific User Facilities Division
- Office of Basic Energy Sciences
- U. S. Department of Energy
- DOE [DE-FG02-05ER46236]
We discuss the large gap anisotropy found for the A(1g) (s wave) state in random-phase approximation spin fluctuation and functional renormalization-group calculations and show how the simple arguments leading to isotropic sign-switched s-wave states in these systems need to be supplemented by a consideration of pair scattering within Fermi-surface sheets and between the individual electron sheets as well. In addition, accounting for the orbital makeup of the states on the Fermi surface is found to be crucial.
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