Superconductivity at 7.8 K in the ternary LaRu2As2 compound  

作　　者：Qi Guo Bo-Jin Pan Jia Yu Bin-Bin Ruan Dong-Yun Chen Xiao-Chuan Wang Qing-Ge Mu Gen-Fu Chen Zhi-An Ren 

机构地区：[1]Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100190,China [2]Collaborative Innovation Center of Quantum Matter Beijing 100190,China

出　　处：《Science Bulletin》2016年第12期921-924,共4页科学通报（英文版）

基　　金：the financial supports from the National Natural Science Foundation of China (11474339);the National Basic Research Program of China (2010CB923000 and 2011CBA00100);the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB07020100)

摘　　要：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 14/ mmm （No. 139）, and the refined lattice parameters are a = 4.182（6）A and c = 10.590（3）A. The temperature dependent resistivity measurement shows a clear superconducting transition with the onset Tc （critical tempera- ture） at 7.8 K, and zero resistivity happens at 6.8 K. The upper critical field at zero temperature μ0Hc2（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.Here we report the discovery of superconductivity in the ternary LaRu_2As_2 compound. The polycrystalline LaRu_2As_2 samples were synthesized by the conventional solid state reaction method. Powder X-ray diffraction analysis indicates that LaRu_2As_2 crystallizes in the Th Cr_2Si_2-type crystal structure with the space group I4/mmm(No. 139), and the refined lattice parameters are a = 4.182(6) and c = 10.590(3) . The temperature dependent resistivity measurement shows a clear superconducting transition with the onset T_c(critical temperature) at 7.8 K, and zero resistivity happens at 6.8 K. The upper critical field at zero temperature μ_0H_(c2)(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 LaRu_2As_2 is a type-II superconductor.

关 键 词：SUPERCONDUCTIVITY LaRu2As2 - Ternarycompound ThCr2Si2-type MAGNETIZATION Uppercritical field 

分 类 号：O511.3[一般工业技术—材料科学与工程]