2009/06/30 by Seiichiro Onari, Hiroshi Kontani · 3 citations
Business, Management and Accounting · Materials Science · Mathematics · Physics and Astronomy · #Algorithm #Condensed matter physics #Impurity #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Materials science #Mathematical analysis #Mathematical physics #Mathematics #Pairing #Particle physics #Physics #Quantum mechanics #Rare-earth and actinide compounds #Reversing #Sign (mathematics) #Spin (aerodynamics) #State (computer science) #Superconductivity #Thermodynamics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.103.177001
published as Phys. Rev. Lett. 103, 177001 (2009) · 4 pages, 4 figures
openalex publication_date 2009/10/21 · arxiv created 2009/10/23 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Based on the five-orbital model, we study the effect of local impurity in iron pnictides, and find that the interband impurity scattering is promoted by the d-orbital degree of freedom. This fact means that the fully gapped sign-reversing s-wave state, which is predicted by spin fluctuation theories, is very fragile against impurities. In the BCS theory, only 1% impurities with intermediate strength induce huge pair breaking, resulting in the large in-gap state and prominent reduction in Tc, contrary to the prediction based on simple orbital-less models. The present study provides a stringent constraint on the pairing symmetry and the electronic states in iron pnictides.