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arXiv · 1608.08352

Superconductivity in the ternary iridium-arsenide BaIr2As2

Xiao-Chuan Wang·Bin-Bin Ruan·Jia Yu·Bo-Jin Pan·Qing-Ge Mu·Tong Liu·Gen-Fu Chen·Zhi-An Ren
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Abstract

Here we report the synthesis and discovery of superconductivity in a novel ternary iridium-arsenide compound BaIr2As2. The polycrystalline BaIr2As2 sample was synthesized by a high temperature and high pressure method. Crystal structural analysis indicates that BaIr2As2 crystallizes in the ThCr2Si2-type layered tetragonal structure with space group I4/mmm (No. 139), and the lattice parameters were refined to be a = 4.052(9) {\AA} and c = 12.787(8) {\AA}. By the electrical resistivity and magnetic susceptibility measurements we found type-II superconductivity in the new BaIr2As2 compound with a Tc (critical temperature) of 2.45 K, and an upper critical field u0Hc2(0) about 0.2 T. Low temperature specific heat measurements gave a Debye temperature about 202 K and a distinct specific jump with delta Ce/{\gamma}Tc = 1.36, which is close to the value of BCS weak coupling limit and confirms the bulk superconductivity in this new BaIr2As2 compound.

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Xiao-Chuan Wang, Bin-Bin Ruan, Jia Yu, Bo-Jin Pan, Qing-Ge Mu, Tong Liu, Gen-Fu Chen, Zhi-An Ren. 2016-08-30. Superconductivity in the ternary iridium-arsenide BaIr2As2. https://doi.org/10.1088/1361-6668/aa5298

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