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| Home > Publications database > Discovery of giant unit-cell super-structure in the infinite-layer nickelate PrNiO$_{2+x}$ |
| Journal Article | PUBDB-2025-00169 |
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2025
Springer Nature
London
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Please use a persistent id in citations: doi:10.1038/s43246-024-00729-4 doi:10.3204/PUBDB-2025-00169
Abstract: 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$_{2+x}$ (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.
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