Physics – Condensed Matter – Superconductivity
Scientific paper
2009-02-28
Phys. Rev. B 79, 134520 (2009)
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures
Scientific paper
10.1103/PhysRevB.79.134520
The existence of a neutron scattering resonance at a wavevector q* implies a sign change of the gap between two Fermi surface regions separated by wavevector q* . For the Fe pnictides, a resonance has been observed for a wavevector 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 an RPA-BCS approximation. Our results show that both sign-switched and extended s-wave gaps 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.
Graser Siegfried
Hirschfeld Peter
Maier Th. A.
Scalapino Douglas J.
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