1996/12/20 by M. V. Sadovskii, A. I. Posazhennikova · 14 citations
Materials Science · Physics and Astronomy · #Anisotropy #Boson #Cooper pair #Impurity #Iron-based superconductors research #Isotropy #Pairing #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1134/1.567359
published in Journal of Experimental and Theoretical Physics Letters 65(3), 270-275 (Pleiades Publishing) · 8 pages, 3 figures, RevTeX 3.0, 1 Postscript figure attached, submitted to JETP Letters
arxiv created 1996/12/20 · openalex publication_date 1997/02/01 · arxiv updated 2016/08/31 · openalex created_date 2017/08/31 · openalex updated_date 2026/08/05
In the weak-coupling BCS-theory approximation, normal impurities do not influence the superconducting transition temperature T c in the case of isotropic s pairing. In the case of d pairing they result in a rapid destruction of the superconducting state. This is at variance with many experiments on the disordering of high-T c superconductors, assuming that d pairing is realized in them. As the interelectronic attraction in a Cooper pair increases, the system transforms continuously from a BCS-type superconductor with “loose” pairs to a picture of superconductivity of “compact,” strongly coupled bosons. Near such a transition substantial deviations can be expected from the universal disorder dependence of T c , as determined by the Abrikosov-Gor’kov equation, and T c becomes more stable against disordering. Since high-T c super-conducting systems fall into the transitional region from BCS-type pairs to compact bosons, these results can explain their relative stability against disordering.