Q-scan analysis of the neutron scattering in iron-based superconductors
Yuki Nagai, Kazuhiko Kuroki
DOI 10.1103/PhysRevB.85.134521 · Physical Review B
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Abstract
We propose a way to determine the pairing state of the iron pnictide superconductors exploiting the momentum (Q) scan of the neutron scattering data. We investigate the spin susceptibility in the s± and s++ superconducting states for various doping levels using the effective five-orbital model and considering the quasiparticle damping. The peak position of the intensity shifts from the position on the line Qx=π to that on the line Qy=0 as the doping level is decreased from electron doping to hole doping. We find that the Q dependence of the ratio of the intensity in the superconducting state to that in the normal state is qualitatively different between the s±-wave and s++-wave pairings. We propose to investigate experimentally this ratio in Q space to distinguish the two pairing states.
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