Superconductivity at 7.8 K in the ternary LaRu2As2 compound

Abstract

Here we report the discovery of superconductivity in the ternary LaRu2As2 compound. The polycrystalline LaRu2As2 samples were synthesized by the conventional solid state reaction method. Powder X-ray diffraction analysis indicates that LaRu2As2 crystallizes in the ThCr2Si2-type crystal structure with the space group I4/mmm (No. 139), and the refined lattice parameters are a = 4.182(6) Å and c = 10.590(3) Å. The temperature dependent resistivity measurement shows a clear superconducting transition with the onset Tc (critical temperature) at 7.8 K, and zero resistivity happens at 6.8 K. The upper critical field at zero temperature m0Hc2(0) was estimated to be 1.6 T from the resistivity measurement. DC magnetic susceptibility measurement shows a bulk superconducting Meissner transition at 7.0 K, and the isothermal magnetization measurement indicates that LaRu2As2 is a type-II superconductor.

Science Bulletin,2016

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• Discovery of a novel 112-type iron-pnictide and La-doping induced superconductivity in Eu1-xLaxFeAs2 (x = 0 ~ 0.15)
• Superconductivity in the ternary iridium-arsenide BaIr2As2
• Superconductivity in LaPd2Bi2 with CaBe2Ge2-type structure
• Synthesis and physical properties of CeRu${}_2$As${}_2$ and CeIr${}_2$As${}_2$
• First-principles study of the electronic structure of CaKRu${}_4$P${}_4$
• Real-space orbital tiling approach for the design of novel superconductors