2005/05/04 by Rostam Moradian, Hamzeh Mousavi
Materials Science · Physics and Astronomy · #Binary number #Coherent potential approximation #Function (biology) #Hubbard model #Impurity #Iron-based superconductors research #Limit (mathematics) #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Scattering #Superconductivity #cond-mat.dis-nn #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/19/6/005
5 pages and 5 figures
arxiv created 2005/05/04 · openalex publication_date 2006/03/14 · openalex created_date 2016/06/24 · arxiv updated 2020/01/09 · openalex updated_date 2026/08/05
For a binary alloy s-wave superconductor in the Bardeen–Cooper–Schrieffer regime (weakly attractive electron interaction), the superconducting critical temperature, T c , is calculated within the coherent potential approximation as a function of the impurity concentration c and the random potentials ε i for different band fillings. In contradiction to Anderson's theorem (AT), we find that T c is dramatically sensitive to c and ε i . Our results show that for low impurity concentrations and weak on-site energies ε i , AT is valid, while in the strong scattering limit even for low impurity concentration, T c is very small for the clean system and on increasing c it is completely suppressed; hence AT is violated in this regime.