Impurity effect as a probe for order parameter symmetry in iron-based superconductors

2009/04/28 by Zhou, Tao, Hu, Xiang, Zhu, Jian-Xin +1
#FOS: Physical sciences #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.0904.4273

Abstract

The pointlike impurity scattering is studied for a superconductor with different pairing symmetries based on a minimal two band model proposed by S. Raghu et al. [Phys. Rev. B \bf 77, R220503 (2008)], and the self-consistent Bogoliubov-de Gennes equations. Two intra-gap resonance peaks are found at or near the nonmagnetic impurity site for a typical s_x²y² symmetry and strong scattering potentials. Such intra-gap resonance peaks are absent for the sign unchanged s-wave and d_x²-y²-wave order parameter. Thus we propose that a non-magnetic impurity with strong scattering potentials can be used to probe the pairing symmetry in iron-based superconductors.

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