Discovery of Giant Unit-Cell Super-Structure in the Infinite-Layer Nickelate PrNiO${}_2$

Abstract

Spectacular quantum phenomena such as superconductivity often emerge in flat-band systems where Coulomb interactions overpower electron kinetics. Engineering strategies for flat-band physics is therefore of great importance. Here, using high-energy grazing-incidence x-ray diffraction, we demonstrate how in-situ temperature annealing of the infinite-layer nickelate PrNiO${}_2$ 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 stems from ordering of diffusive oxygen. The stability of this superlattice structure suggests a connection to an energetically favorable electronic state of matter. As such, our study provides a new pathway - different from Moiré structures - to ultra-small Brillouin zone electronics.

arXiv commentMain: 7 pages, 4 figures. Supplementary: 2 pages, 3 figures

References in corpus (21)

• Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O(6+x)
• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Ubiquitous Interplay between Charge Ordering and High-Temperature Superconductivity in Cuprates
• Superconducting Dome in Nd${}_{1-x}$Sr${}_x$NiO${}_2$ Infinite Layer Films
• Electronic structure of the parent compound of superconducting infinite-layer nickelates
• Phase diagram and superconducting dome of infinite-layer $\mathrm{N}{\mathrm{d}}_{1-\mathrm{x}}\mathrm{S}{\mathrm{r}}_{\mathrm{x}}\mathrm{Ni}{\mathrm{O}}_2$ thin films
• Orbital textures and charge density waves in transition metal dichalcogenides
• A superconducting praseodymium nickelate with infinite layer structure
• Superconductivity in infinite-layer nickelate La${}_{1-x}$Ca${}_x$NiO${}_2$ thin films
• Nickelate superconductors -- a renaissance of the one-band Hubbard model
• Phase Diagram of Infinite Layer Praseodymium Nickelate Pr${}_{1-x}$Sr${}_x$NiO${}_2$ Thin Films
• Doping evolution of the Mott-Hubbard landscape in infinite-layer nickelates
• Charge density waves in infinite-layer NdNiO${}_2$ nickelates
• Charge and spin order dichotomy in NdNiO${}_2$ driven by SrTiO${}_3$ capping layer
• Materials Design for New Superconductors
• Absence of $3a_0$ Charge Density Wave Order in the Infinite Layer Nickelates
• Charge distribution across capped and uncapped infinite-layer neodymium nickelate thin films
• Sudden collapse of magnetic order in oxygen deficient nickelate films
• A Nickelate Renaissance
• Topotactic-hydrogen forms chains in $AB$O${}_2$ nickelate superconductors
• Two Distinct Charge Orders in Infinite-layer PrNiO2+δ revealed by Resonant X-ray Diffraction