Neutron scattering resonance and the iron-pnictide superconducting gap
T. A. Maier, S. Graser, D. J. Scalapino, P. Hirschfeld
DOI 10.1103/PhysRevB.79.134520 · Physical Review B
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Abstract
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 Γ 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 (π,0) and that scattering at other momentum transfers can be useful in distinguishing between gap structures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Fe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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