三元砷化铱BaIr2As2的超导电性
Superconductivity in the ternary iridium-arsenide BaIr2As2
摘要：
在这里，我们报告的合成和发现的超导电性在一个新的三元铱砷化合物BaIr 2As 2。采用高温高压法合成了BaIr_2As_2多晶样品。晶体结构分析表明，BaIr_2As_2为ThCr_2Si_2型层状四方晶系结构，空间群为I_4/mmm（No.139），晶格参数为a = 4.052（9）nm，c = 12.787（8）nm。通过电阻率和磁化率的测量，我们发现BaIr_2As_2化合物具有Ⅱ型超导电性，其T_c（临界温度）为2.45 K，上临界场u_0 H_c_2（0）约为0.2 T。低温比热测量结果表明，该化合物的德拜温度约为202 K，比跃变明显，δ Ce/γTc = 1.36，接近BCS弱耦合极限，证实了该化合物的体超导电性。
英文摘要：
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) Å and c = 12.787(8) Å. 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/γTc = 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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