2016/08/30 by Xiao-Chuan Wang, Bin-Bin Ruan, Jia Yu +5
Materials Science · Physics and Astronomy · #Critical field #Crystallite #Debye model #Electrical resistivity and conductivity #Iron-based superconductors research #Magnetic susceptibility #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Specific heat #Superconductivity #Ternary operation #Tetragonal crystal system #cond-mat.supr-con
paper · pdf · doi:10.1088/1361-6668/aa5298
published as Supercond. Sci. Technol. 30 (2017) 035007
arxiv created 2016/08/30 · openalex created_date 2016/09/16 · openalex publication_date 2017/01/12 · arxiv updated 2017/08/22 · openalex updated_date 2026/08/05
Abstract Here we report the synthesis and discovery of superconductivity in a novel ternary iridium–arsenide compound BaIr 2 As 2 . The polycrystalline BaIr 2 As 2 sample was first synthesized by a high temperature and high pressure method. Crystal structural analysis indicates that BaIr 2 As 2 crystallizes in the ThCr 2 Si 2 -type layered tetragonal structure with space group I 4 /mmm (No. 139), and the lattice parameters were refined to be a = 4.052(9) Å and c = 12.787(8) Å. By the electrical resistivity and magnetic susceptibility measurements we found type-II superconductivity in the new BaIr 2 As 2 compound with a T c (critical temperature) of 2.45 K, and an upper critical field μ 0 H c2 (0) about 0.2 T. Low temperature specific heat measurements gave a Debye temperature of about 202 K and a distinct specific jump with Δ C e /γT c = 1.36, which is close to the value of BCS weak coupling limit and confirms the bulk superconductivity in this new BaIr 2 As 2 compound.