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<p>The discovery of unconventional superconductivity often triggers significant interest in associated electronic and structural symmetry breaking phenomena. For the infinite-layer nickelates, structural allotropes are investigated intensively. Here, using high-energy grazing-incidence x-ray diffraction, we demonstrate how in-situ temperature annealing of the infinite-layer nickelate PrNiO<sub>2+<i>x</i></sub> (<i>x</i> ≈ 0) induces a giant superlattice structure. The annealing effect has a maximum well above room temperature. By covering a large scattering volume, we show a rare period-six in-plane (bi-axial) symmetry and a period-four symmetry in the out-of-plane direction. This giant unit-cell superstructure—likely stemming from ordering of diffusive oxygen—persists over a large temperature range and can be quenched. As such, the stability and controlled annealing process leading to the formation of this superlattice structure provides a pathway for novel nickelate chemistry.</p>

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Discovery of giant unit-cell super-structure in the infinite-layer nickelate PrNiO2+x

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月7日

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  • Jens Oppliger,
  • Julia Küspert,
  • Ann-Christin Dippel,
  • Martin v. Zimmermann,
  • Olof Gutowski,
  • Xiaolin Ren,
  • Xingjiang Zhou,
  • Zhihai Zhu,
  • Ruggero Frison,
  • Qisi Wang,
  • Leonardo Martinelli,
  • Izabela Biało,
  • Johan Chang

摘要

The discovery of unconventional superconductivity often triggers significant interest in associated electronic and structural symmetry breaking phenomena. For the infinite-layer nickelates, structural allotropes are investigated intensively. Here, using high-energy grazing-incidence x-ray diffraction, we demonstrate how in-situ temperature annealing of the infinite-layer nickelate PrNiO2+x (x ≈ 0) induces a giant superlattice structure. The annealing effect has a maximum well above room temperature. By covering a large scattering volume, we show a rare period-six in-plane (bi-axial) symmetry and a period-four symmetry in the out-of-plane direction. This giant unit-cell superstructure—likely stemming from ordering of diffusive oxygen—persists over a large temperature range and can be quenched. As such, the stability and controlled annealing process leading to the formation of this superlattice structure provides a pathway for novel nickelate chemistry.