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@ARTICLE{Oppliger:622083,
      author       = {Oppliger, Jens and Küspert, Julia and Dippel, Ann-Christin
                      and v. Zimmermann, Martin and Gutowski, Olof and Ren,
                      Xiaolin and Zhou, Xingjiang and Zhu, Zhihai and Frison,
                      Ruggero and Wang, Qisi and Martinelli, Leonardo and Biało,
                      Izabela and Chang, Johan},
      title        = {{D}iscovery of giant unit-cell super-structure in the
                      infinite-layer nickelate {P}r{N}i{O}$_{2+x}$},
      journal      = {Communications materials},
      volume       = {6},
      number       = {1},
      issn         = {2662-4443},
      address      = {London},
      publisher    = {Springer Nature},
      reportid     = {PUBDB-2025-00169},
      pages        = {3},
      year         = {2025},
      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.},
      cin          = {DOOR ; HAS-User / FS-PETRA-D},
      ddc          = {600},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PETRA-D-20210408},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      CALIPSOplus - Convenient Access to Light Sources Open to
                      Innovation, Science and to the World (730872)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(EU-Grant)730872},
      experiment   = {EXP:(DE-H253)P-P07-20150101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:39780911},
      UT           = {WOS:001390550100001},
      doi          = {10.1038/s43246-024-00729-4},
      url          = {https://bib-pubdb1.desy.de/record/622083},
}