论文标题
具有无限层结构的超导praseodymim镍
A superconducting praseodymium nickelate with infinite layer structure
论文作者
论文摘要
长期以来，已经研究了多种氧化氧化物化合物，以表现出各种相关电子现象。最近，在纳米级无限层镍薄膜中观察到了超导性，该薄膜的Nd $ _ {0.8} $ sr $ _ {0.2} $ nio $ _2 $，在perovskite tooptactic降低的Srtio $ _3 $ siderates上表现出稳定，从perovskite perovskite the perovskite copertor阶段稳定。在这里，我们介绍prnio $ _2 $薄膜的综合和属性在srtio $ _3 $上。掺杂pr $ _ {0.8} $ sr $ _ {0.2} $ nio $ _2 $，我们观察到超导性，过渡温度为7-12 k，在2 k的334 ka/cm $ $^2 $的2 k时，稳健的临界电流密度可强。这些发现表明，无限层镍的超导性对稀土4 $ f $配置的细节相对不敏感。此外，它们激发了基于二维Nio $ _2 $飞机对更广泛的化合物的探索，这将使对超导和正常状态特性及其潜在机制进行系统的研究。
A variety of nickel oxide compounds have long been studied for their manifestation of various correlated electron phenomena. Recently, superconductivity was observed in nanoscale infinite layer nickelate thin films of Nd$_{0.8}$Sr$_{0.2}$NiO$_2$, epitaxially stabilized on SrTiO$_3$ substrates via topotactic reduction from the perovskite precursor phase. Here we present the synthesis and properties of PrNiO$_2$ thin films on SrTiO$_3$. Upon doping in Pr$_{0.8}$Sr$_{0.2}$NiO$_2$, we observe superconductivity with a transition temperature of 7-12 K, and robust critical current density at 2 K of 334 kA/cm$^2$. These findings indicate that superconductivity in the infinite layer nickelates is relatively insensitive to the details of the rare earth 4$f$ configuration. Furthermore, they motivate the exploration of a broader family of compounds based on two-dimensional NiO$_2$ planes, which will enable systematic investigation of the superconducting and normal state properties and their underlying mechanisms.
