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Superconductivity in an infinite-layer nickelate

机译：无限层镍酸盐中的超导性

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The discovery of unconventional superconductivity in (La,Ba)(2)CuO4 (ref.(1)) has motivated the study of compounds with similar crystal and electronic structure, with the aim of finding additional superconductors and understanding the origins of copper oxide superconductivity. Isostructural examples include bulk superconducting Sr2RuO4 (ref.(2)) and surface-electron-doped Sr2IrO4, which exhibits spectroscopic signatures consistent with a superconducting gap(3,4), although a zero-resistance state has not yet been observed. This approach has also led to the theoretical investigation of nickelates(5,6), as well as thin-film heterostructures designed to host superconductivity. One such structure is the LaAlO3/LaNiO3 superlattice(7-9), which has been recently proposed for the creation of an artificially layered nickelate heterostructure with a singly occupied d(x2-y2) band. The absence of superconductivity observed in previous related experiments has been attributed, at least in part, to incomplete polarization of the e(g) orbitals(10). Here we report the observation of superconductivity in an infinite-layer nickelate that is isostructural to infinite-layer copper oxides(11-13). Using soft-chemistry topotactic reduction(14-20), NdNiO2 and Nd0.8Sr0.2NiO2 single-crystal thin films are synthesized by reducing the perovskite precursor phase. Whereas NdNiO2 exhibits a resistive upturn at low temperature, measurements of the resistivity, critical current density and magnetic-field response of Nd0.8Sr0.2NiO2 indicate a superconducting transition temperature of about 9 to 15 kelvin. Because this compound is a member of a series of reduced layered nickelate crystal structures(21-23), these results suggest the possibility of a family of nickelate superconductors analogous to copper oxides(24) and pnictides(25).
机译：（La，Ba）（2）CuO4（参考文献（1））中非常规超导性的发现激发了具有相似晶体和电子结构的化合物的研究，目的是寻找其他超导体并了解氧化铜超导性的起源。同构的例子包括块状超导Sr2RuO4（参考文献（2））和表面电子掺杂的Sr2IrO4，尽管尚未观察到零电阻状态，但其光谱特征与超导间隙（3,4）一致。这种方法还导致了镍酸盐（5,6）以及旨在承载超导性的薄膜异质结构的理论研究。一种这样的结构是LaAlO3 / LaNiO3超晶格（7-9），最近有人提出用它来创建具有单独占据的d（x2-y2）谱带的人工层状镍酸盐异质结构。在先前的相关实验中观察到的超导性的缺乏至少部分归因于e（g）轨道的极化不完全（10）。在这里我们报道了在无限层镍酸盐中超导性的观察结果，该镍酸盐与无限层铜氧化物同构（11-13）。利用软化学将其还原（14-20），通过还原钙钛矿前体相合成了NdNiO2和Nd0.8Sr0.2NiO2单晶薄膜。尽管NdNiO2在低温下呈现出电阻上升趋势，但Nd0.8Sr0.2NiO2的电阻率，临界电流密度和磁场响应的测量结果表明，超导转变温度约为9至15开尔文。由于该化合物是一系列还原层状镍酸盐晶体结构的成员（21-23），因此这些结果表明，可能存在类似于氧化铜（24）和磷化物（25）的一系列镍酸盐超导体。

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  • 来源
    《Nature》 |2019年第7771期|624-627|共4页
  • 作者

    Li Danfeng; Lee Kyuho; Wang Bai Yang; Osada Motoki; Crossley Samuel; Lee Hye Ryoung; Cui Yi; Hikita Yasuyuki; Hwang Harold Y.;

  • 作者单位

    SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA|Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA;

    SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA|Stanford Univ, Dept Phys, Stanford, CA 94305 USA;

    SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA|Stanford Univ, Dept Phys, Stanford, CA 94305 USA;

    SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA|Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA;

    SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA|Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA;

    SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA|Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA;

    SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA|Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA;

    SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA;

    SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA|Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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