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Superconductivity in an infinite-layer nickelate

机译：无限层镍中的超导性

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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））中的非传统超导的发现是促进了具有相似晶体和电子结构的化合物的研究，目的是找到额外的超导体并理解氧化铜超导性的起源。 IsoStrontucture实例包括块状超导Sr2RuO4（参考REF。（2））和表面电子掺杂的SR2104，其表现出与超导间隙（3,4）一致的光谱签名，尽管尚未观察到零电阻状态。这种方法也导致了对镍酯（5,6）的理论研究，以及薄膜异质结构，旨在置于宿主超导性。一种这样的结构是Laalo3 / Lanio3超晶格（7-9），最近已经提出用于创造具有单独占用的D（X2-Y2）带的人工分层的镍异质结构。在先前的相关实验中观察到的超导性至少部分地归因于E（g）轨道（10）的不完全偏振。在这里，我们报告了在无限层镍中的超导性观察，该镍酸盐是无限层氧化铜（11-13）的。使用软化化学拓展（14-20），通过减少钙钛矿前体相，合成NdNiO 2和Nd0.8Sr0.2NiO2单晶薄膜。然而，NdniO2在低温下表现出电阻性升高，测量的电阻率，临界电流密度和ND0.8SR0.2NIO2的磁场响应表明超导过渡温度为约9至15个开尔文。因为该化合物是一系列减少的层状镍晶体结构（21-23）的成员，所以这些结果表明了类似于氧化铜氧化铜（24）和Pnictides（25）的镍超导体的可能性。

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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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