Superconductivity at 9–15 K was recently discovered in Nd_0.8Sr_0.2NiO₂ films. Since the Ni¹⁺ ionic state in NdNiO₂ may have the same 3d⁹ outer-shell electronic orbital as in cuprate superconductors, it is interesting to know whether superconductivity has a similar mechanism in these two systems. Here we synthesize bulk samples of Nd_1−xSr_xNiO₂ (x = 0, 0.2, 0.4) with inhomogeneous Sr distribution and Ni deficiency. Resistivity measurements show insulating behavior without the presence of superconductivity, different to the previously reported films. Although applying pressure up to about 50.2 GPa significantly suppresses the insulating behavior, superconductivity remains absent. The magnetization behavior exhibits a Curie–Weiss law with a paramagnetic moment of about 2 μ_B/f.u. Since the lattice constants derived from our diffraction data are very close to the previously reported superconducting Nd_0.8Sr_0.2NiO₂ films, we suggest that superconductivity in that system may have arisen from interface or stress-related effects, or nickel deficiency in our bulk samples that might prevent the emergence of superconductivity.

最近在Nd _0.8 Sr _0.2 NiO ₂薄膜中发现了9-15 K的超导性。由于NdNiO _2中的Ni ¹⁺离子态可能具有与铜酸盐超导体中相同的3d ⁹外壳电子轨道，因此有趣的是，在这两个系统中，超导性是否具有相似的机理。在这里，我们合成了Nd _{1− x} Sr _x NiO ₂（x = 0、0.2、0.4），且Sr分布不均匀且Ni缺乏。电阻率测量显示绝缘行为而没有超导性，这与先前报道的薄膜不同。尽管施加高达约50.2 GPa的压力会显着抑制绝缘性能，但仍不存在超导性。磁化行为表现出居里-外斯定律用约2μ的顺磁性力矩_乙/复由于从我们的衍射数据导出的晶格常数非常接近先前报道的超导的Nd _0.8锶_0.2的NiO ₂ 薄膜，我们认为该系统中的超导性可能是由于界面或应力相关的效应引起的，或者是由于我们大量样品中的镍缺乏而可能阻止了超导性的出现。