Quasiparticle scattering interference in superconducting iron pnictides
نویسندگان
چکیده
Using both two orbital and five orbital models, we investigate the quasiparticle interference QPI patterns in the superconducting SC state of iron-based superconductors. We compare the results for nonmagnetic and magnetic impurities in sign-changed s-wave cos kx · cos ky and sign-unchanged cos kx · cos ky SC states. While the patterns strongly depend on the chosen band structure details, the sensitivity of peaks around ,0 and 0, wave vectors on magnetic or nonmagnetic impurities, and on sign-changed or signunchanged SC orders is a common feature. Our results suggest that the QPI can provide evidence of the pairing symmetry in the SC states.
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