Abstract
Effect of two-dimensionality of crystal structure on superconducting transition temperature(Tc) in iron arisenides with thick perovskite-type layer was investigated. Solid solutions of (Fe2As2)(Ca4(Sc,Ti)3Oy) and (Fe2As2)(Ca4(Mg,Ti)3Oy), as well as (Fe2As2)(Ca5(Sc,Ti)4Oy) and (Fe2As2)(Ca5(Mg,Ti)4Oy) were successfully fabricated. Lattice constants were systematically controlled by mixing ratio of Mg, Sc and Ti. All samples show bulk superconductivity at 30 – 40 K. Maximum Tc was achieved at a = 3.88 Å in both (Fe2As2)(Ca4M3Oy) and (Fe2As2)(Ca5M4Oy) compounds. Tc slightly decreases with increasing thickness of the perovskite-type layer. It indicates that the interlayer distance does not have positive effect on Tc in layered iron arsenides with thick blocking layers.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call