Q-scan-analysis of the neutron scattering in iron-based superconductors

Details Q-scan-analysis of the neutron scattering in iron-based superconductors Q-scan-analysis of the neutron scattering in iron-based superconductors

2012-01-12

arxiv.org/abs/1201.2453v1

Physics

Condensed Matter

Superconductivity

7 pages, 7 figures

Scientific paper

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 Q_{x} = \pi to that on the line Q_{y} = 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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