Investigation of the substitution at the anionic positions BaT2As2 (T = Fe, Ni) superconductors

Resumo

The possibilities of electron/hole doping of two ternary arsenides, BaFe₂As₂ and BaNi₂As₂, via partial substitution at the arsenic position by 16 and 14 group elements, have been studied. While no substitution has been observed for chalcogens, BaFe₂As₂ incorporates Sb, Si, and Ge at the As site; BaNi₂As₂ incorporates Sb, Ge, Sn, and Pb. The observed results can be tentatively explained suggesting that 14 group elements are incorporated into the BaT₂As₂ structures as X⁶⁻₂ dumbbells.