期刊
PHYSICAL REVIEW B
卷 79, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.134520
关键词
BCS theory; Brillouin zones; Fermi surface; iron compounds; neutron diffraction; RPA calculations; superconducting energy gap; superconducting materials
资金
- U. S. Department of Energy [DE-FG02-05ER46236]
- U.S. Department of Energy (DOE) [DE-FG02-05ER46236] Funding Source: U.S. Department of Energy (DOE)
The existence of a neutron scattering resonance at a wave vector q(*) implies a sign change of the gap between two Fermi-surface regions separated by wave vector q(*). For the Fe pnictides, a resonance has been observed for a wave vector q(*) which connects a hole Fermi surface around the Gamma point with an electron Fermi surface around the X or Y points of the 1 Fe/unit cell Brillouin zone. Here we study the neutron scattering resonance for a five-orbital model within a random-phase approximation-BCS approximation. Our results show that both an isotropic sign-switched and an anisotropic extended s-wave gap are consistent with the present data for q(*) near (pi,0) and that scattering at other momentum transfers can be useful in distinguishing between gap structures.
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