Quasiparticle scattering interference in superconducting iron pnictides

Yan-Yang Zhang; Chen Fang; Xiaoting Zhou; Kangjun Seo; Wei-Feng Tsai; B. Andrei Bernevig; Jiangping Hu

doi:10.1103/PhysRevB.80.094528

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Quasiparticle scattering interference in superconducting iron pnictides

Yan-Yang Zhang, Chen Fang, Xiaoting Zhou, Kangjun Seo, Wei-Feng Tsai, B. Andrei Bernevig, Jiangping Hu

DOI 10.1103/PhysRevB.80.094528 · Physical Review B

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Abstract

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 (±π,0) and (0,±π) wave vectors on magnetic or nonmagnetic impurities, and on sign-changed or sign-unchanged SC orders is a common feature. Our results suggest that the QPI can provide evidence of the pairing symmetry in the SC states.