论文标题
nd $ _ {1-x} $ sr $ _x $ nio $ _2 $无限层电影中的超导圆顶
Superconducting Dome in Nd$_{1-x}$Sr$_x$NiO$_2$ Infinite Layer Films
论文作者
论文摘要
我们报告了nd $ _ {1-x} $ sr $ _x $ nio $ _2 $无限层薄膜的相图。发现了一个超过0.125 <x <0.25 $的超导圆顶，与丘比特非常相似，尽管在较窄的掺杂窗口上。但是，虽然库酸酯的超导性是由用于失败的绝缘体和用于过度作用的金属的界限，但我们在这里观察到圆顶两侧的弱绝缘行为。此外，与观察到的$ \ sim 1/x $依赖性相比，正常的州堂的系数始终很小，并且在掺杂和温度下连续零交叉近距离交叉。这表明存在电子和孔状带，与带结构计算一致。
We report the phase diagram of Nd$_{1-x}$Sr$_x$NiO$_2$ infinite layer thin films grown on SrTiO$_3$. A superconducting dome spanning $0.125 < x < 0.25$ is found, remarkably similar to cuprates, albeit over a narrower doping window. However, while cuprate superconductivity is bounded by an insulator for underdoping and a metal for overdoping, here we observe weakly insulating behavior on either side of the dome. Furthermore, the normal state Hall coefficient is always small and proximate to a continuous zero crossing in doping and in temperature, in contrast to the $\sim 1/x$ dependence observed for cuprates. This suggests the presence of both electron- and hole-like bands, consistent with band structure calculations.
