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<p>The discovery of superconductivity in nickelates has motivated intensive efforts to identify the fundamental interactions that mirror or distinguish them from high-<i>T</i><sub><i>c</i></sub> cuprate superconductors. Nickelate superconductors, which are hole-doped within the layered structure of RNiO<sub>2</sub>, share structural similarities with high-<i>T</i><sub><i>c</i></sub> cuprate superconductors. However, despite similarities in formal valence and crystal symmetry, the fundamental nature of the superconducting state and the parent compound phase in nickelates remains elusive. Strong electronic correlations in infinite-layer nickelates (Re<sub>1−<i>x</i></sub>Sr<sub><i>x</i></sub>NiO<sub>2</sub>) suggest a potentially complex phase diagram, akin to that observed in cuprates, yet a key question about the magnetic ground state remains unanswered. Through magnetoresistance measurements, we observe a universal fourfold rotational symmetry that persists across the entire doping range 0.08&#xa0;&lt;&#xa0;<i>x</i>&#xa0;&lt;&#xa0;0.18, from the weakly insulating parent compound to the superconducting state. Notably, this four-fold symmetry displays a <i>π</i>/4 phase shift with doping or applied magnetic field. This universal symmetry and its characteristic phase shift strikingly parallel the behavior of the electron-doped cuprates, where such signatures are tied to underlying magnetic order. Our modeling suggests that this persistent anisotropy is consistent with the influence of an underlying antiferromagnetic order, providing a unified framework for the electronic ground state throughout the nickelate phase diagram.</p>

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Universal four-fold symmetry in infinite-layer nickelates

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月7日

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  • Ariel Matzliach,
  • Idan S. Wallerstein,
  • Yoav Mairovich,
  • Himadri R. Dakua,
  • Raz Luger,
  • Martin Gonzalez,
  • Harold Y. Hwang,
  • Eran Maniv,
  • Eytan Grosfeld,
  • Muntaser Naamneh

摘要

The discovery of superconductivity in nickelates has motivated intensive efforts to identify the fundamental interactions that mirror or distinguish them from high-Tc cuprate superconductors. Nickelate superconductors, which are hole-doped within the layered structure of RNiO2, share structural similarities with high-Tc cuprate superconductors. However, despite similarities in formal valence and crystal symmetry, the fundamental nature of the superconducting state and the parent compound phase in nickelates remains elusive. Strong electronic correlations in infinite-layer nickelates (Re1−xSrxNiO2) suggest a potentially complex phase diagram, akin to that observed in cuprates, yet a key question about the magnetic ground state remains unanswered. Through magnetoresistance measurements, we observe a universal fourfold rotational symmetry that persists across the entire doping range 0.08 < x < 0.18, from the weakly insulating parent compound to the superconducting state. Notably, this four-fold symmetry displays a π/4 phase shift with doping or applied magnetic field. This universal symmetry and its characteristic phase shift strikingly parallel the behavior of the electron-doped cuprates, where such signatures are tied to underlying magnetic order. Our modeling suggests that this persistent anisotropy is consistent with the influence of an underlying antiferromagnetic order, providing a unified framework for the electronic ground state throughout the nickelate phase diagram.