2012/01/31 by S. L. Liu, S L Liu, Tao Zhou
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-8984/24/22/225701
published as J. Phys.: Condens. Matter 24 (2012) 225701 · 5 pages, 4 figures
arxiv created 2012/02/24 · openalex publication_date 2012/05/04 · arxiv updated 2012/05/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study theoretically the effect of transition-metal (TM) substitution in iron-based superconductors through treating all of the TM ions as randomly distributed impurities. The extra electrons from TM elements are localized at the impurity sites. In the meantime the chemical potential shifts upon substitution. The phase diagram is mapped out and it seems that the TM elements can act as effective dopants. The local density of states (LDOS) is calculated and the bottom becomes V-shaped as the impurity concentration increases. The LDOS at the Fermi energy ρ(ω = 0) is finite and reaches the minimum at the optimal doping level. Our results are in good agreement with scanning tunneling microscopy experiments.