Nickelate Superconductivity without Rare-Earth Magnetism: (La,Sr)NiO2,Advanced Materials

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Nickelate Superconductivity without Rare-Earth Magnetism: (La,Sr)NiO2
Advanced Materials ( IF 27.4 ) Pub Date : 2021-09-18 , DOI: 10.1002/adma.202104083
Motoki Osada _{1,

2} , Bai Yang Wang _{1,

3} , Berit H Goodge _{4,

5} , Shannon P Harvey _{1,

2} , Kyuho Lee _{1,

3} , Danfeng Li _{1,

2,

6} , Lena F Kourkoutis _{4,

5} , Harold Y Hwang _{1,

2}

Affiliation

The occurrence of unconventional superconductivity in cuprates has long motivated the search for manifestations in other layered transition metal oxides. Recently, superconductivity is found in infinite-layer nickelate (Nd,Sr)NiO₂ and (Pr,Sr)NiO₂ thin films, formed by topotactic reduction from the perovskite precursor phase. A topic of much current interest is whether rare-earth moments are essential for superconductivity in this system. In this study, it is found that with significant materials optimization, substantial portions of the La₁₋_xSr_xNiO₂ phase diagram can enter the regime of coherent low-temperature transport (x = 0.14 - 0.20), with subsequent superconducting transitions and a maximum onset of ≈9 K at x = 0.20. Additionally, the unexpected indication of a superconducting ground state in undoped LaNiO₂ is observed, which likely reflects the self-doped nature of the electronic structure. Combining the results of (La/Pr/Nd)₁₋_xSr_xNiO₂ reveals a generalized superconducting dome, characterized by systematic shifts in the unit cell volume and in the relative electron-hole populations across the lanthanides.

中文翻译：

无稀土磁性的镍酸盐超导性：(La,Sr)NiO2

铜酸盐中非常规超导性的出现长期以来一直激励着寻找其他层状过渡金属氧化物的表现形式。最近，在无限层镍酸盐 (Nd,Sr)NiO ₂和 (Pr,Sr)NiO ₂薄膜中发现了超导性，这些薄膜是通过从钙钛矿前体相的拓扑还原形成的。当前非常感兴趣的一个话题是，稀土矩对于该系统中的超导性是否必不可少。在这项研究中，发现通过显着的材料优化，La ₁₋_x Sr _x NiO ₂相图的大部分可以进入相干低温输运状态（x = 0.14 - 0.20)，随后发生超导跃迁，并且在x = 0.20处最大起始值约为 9 K。此外，观察到未掺杂的 LaNiO _{2 中}超导基态的意外迹象，这可能反映了电子结构的自掺杂性质。结合 (La/Pr/Nd) ₁₋_x Sr _x NiO _{2 的结果}揭示了广义超导圆顶，其特征在于单位晶胞体积和整个镧系元素的相对电子-空穴数量的系统变化。

更新日期：2021-11-09

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