论文标题
无限层的相图Praseodymim镍pr $ _ {1-x} $ sr $ _ {x} $ nio $ _2 $ thin films
Phase Diagram of Infinite Layer Praseodymium Nickelate Pr$_{1-x}$Sr$_{x}$NiO$_2$ Thin Films
论文作者
论文摘要
我们报告了无限层的相图pr $ _ {1-x} $ sr $ _ {x} $ nio $ _2 $薄膜通过使用cah $ _2 $从perovskite Propursor阶段从perovskite Protursor阶段合成的薄膜。基于电气传输特性，我们发现一个依赖于掺杂的超导圆顶在$ x $ = 0.12和0.28之间，最大超导过渡温度$ t _ {\ rm {c}} $ 14 k的$ x $ x $ = 0.18，由两侧的弱绝缘行为限制。与Nd $ _ {1-x} $ sr $ _ {x} $ nio $ _2 $中观察到的较窄圆顶相反，一个本地$ t _ {\ rm {c}} $抑制在$ x $ = 0.2附近未观察到pr $ _ {1-x} $ sr $ sr $ sr $ sr $ sry = 0.2。正常的国大厅效应测量表明电子和孔的混合载体贡献，并显示出Hall系数作为温度和$ x $的标志变化，与Nd $ _ {1-x} $ sr $ _ {x} $ _2 $ $ nio $ _2 $相似。同样类似的是，观察到与超导组合物相关的正常状态电阻率的最小值。这些发现表明，无限层镍相图对稀土元件相对不敏感，但表明由于稀有地点的离子半径的变化而引起的障碍会影响超导圆顶。
We report the phase diagram of infinite layer Pr$_{1-x}$Sr$_{x}$NiO$_2$ thin films synthesized via topotactic reduction from the perovskite precursor phase using CaH$_2$. Based on the electrical transport properties, we find a doping-dependent superconducting dome extending between $x$ = 0.12 and 0.28, with a maximum superconducting transition temperature $T_{\rm{c}}$ of 14 K at $x$ = 0.18, bounded by weakly insulating behavior on both sides. In contrast to the narrower dome observed in Nd$_{1-x}$Sr$_{x}$NiO$_2$, a local $T_{\rm{c}}$ suppression near $x$ = 0.2 was not observed for the Pr$_{1-x}$Sr$_{x}$NiO$_2$ system. Normal state Hall effect measurements indicate mixed carrier contributions of both electrons and holes, and show a sign change in the Hall coefficient as functions of temperature and $x$, quite similar to that in Nd$_{1-x}$Sr$_{x}$NiO$_2$. Also similar is the observation of a minimum in the normal state resistivity associated with the superconducting compositions. These findings indicate an infinite layer nickelate phase diagram that is relatively insensitive to the rare-earth element, but suggest that disorder arising from the variations of the ionic radii on the rare-earth site affects the superconducting dome.
