2008/09/30 by Y. Senga, Yuko Senga, Hiroshi Kontani +1 · 4 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Condensed matter physics #Corporate Taxation and Avoidance #Impurity #Iron-based superconductors research #Magnetic impurity #Materials science #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Reversing #Scattering #Sign (mathematics) #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.77.113710
published as J. Phys. Soc. Jpn. 77 (2008) 113710 (4 pages) · Some discussions have been added
openalex publication_date 2008/11/10 · arxiv created 2008/12/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
To understand the impurity effect on Tc in FeAs superconductors, we analyze a simple two-band BCS model with repulsive interband interaction. The realized fully-gapped superconducting state with sign reversal, which is predicted by spin fluctuation theories in this compound, is suppressed by impurities due to the interband hopping of Cooper pairs, if the interband impurity scattering I' is equal to the intraband one I. When |I'/I| < 1, in highly contrast, Tc is almost unchanged by strong impurity scattering since the interband scattering is almost prohibited by the multiple scattering effect. Since |I'/I| ∼ 0.5 is expected, the robustness of superconductivity against impurities in FeAs superconductors is naturally understood in term of the sign reversing fully-gapped state.