Quasiparticle Scattering Interference in Superconducting Iron-pnictides

Details Quasiparticle Scattering Interference in Superconducting Iron-pnictides Quasiparticle Scattering Interference in Superconducting Iron-pnictides

2009-03-10

arxiv.org/abs/0903.1694v1

Phys. Rev. B 80 094528 (2009)

Physics

Condensed Matter

Superconductivity

12 pages, 16 figures

Scientific paper

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 $\cos(k_x)\cdot\cos(k_y)$ and sign-unchanged $|\cos(k_x)\cdot\cos(k_y)|$ SC states. While the patterns strongly depend on the chosen band structures, the sensitivity of peaks around $(\pm\pi,0)$ and $(0,\pm\pi)$ wavevectors on magnetic or non-magnetic impurity, and sign change or sign unchanged SC orders is common in two models. Our results strongly suggest that QPI may provide direct information of band structures and evidence of the pairing symmetry in the SC states.

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