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@ARTICLE{Hareesh:1022220,
      author       = {Hareesh, Chavana and Ceretti, Monica and Papet, Philippe
                      and Bosak, Alexeï and Meven, Martin and Paulus, Werner},
      title        = {{S}ynthesis and {S}tructural {C}haracterization of
                      {L}ayered {N}i$^{+1/+2}$ {O}xides {O}btained by {T}opotactic
                      {O}xygen {R}elease on
                      {N}d$_{2−x}${S}r$_{x}${N}i{O}$_{4−δ}$ {S}ingle
                      {C}rystals},
      journal      = {Crystals},
      volume       = {13},
      number       = {12},
      issn         = {2073-4352},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {FZJ-2024-01341},
      pages        = {1670 -},
      year         = {2023},
      abstract     = {Layered nickelate oxides containing Ni$^{1+}$/Ni$^{2+}$ are
                      isoelectronic to Cu$^{2+}$/Cu$^{3+}$ compounds and of
                      present interest with respect to recent findings of
                      superconductivity in a series of different compositions. It
                      is thereby questionable why superconductivity is still rare
                      to find in nickelates, compared to the much larger amount of
                      superconducting cuprates. Anisotropic $d_{z^2}$ vs.
                      $d_{x^2−y^2}$ orbital occupation as well as
                      interface-induced superconductivity are two of the main
                      advanced arguments. We are here interested in investigating
                      the feasibility of synthesizing layered nickelate-type
                      oxides, where the Ni$^{1+}$/Ni$^{2+}$ ratio can be tuned by
                      oxygen and/or cation doping. Our strategy is to synthesize
                      Sr-doped $n$ = 1 Ruddlesden–Popper type
                      Nd$_{2−x}$Sr$_x$NiO$_{4+δ}$ single crystals, which are
                      then reduced by H$_2$ gas, forming
                      Nd$_{2−x}$Sr$_x$NiO$_{4−δ}$ via a topotactic oxygen
                      release at moderate temperatures. We report here on
                      structural studies carried out on single crystals by
                      laboratory and synchrotron diffraction using pixel
                      detectors. We evidence the general possibility to obtain
                      reduced single crystals despite their increased
                      orthorhombicity. This must be regarded as a milestone to
                      obtain single crystalline nickelate oxides, which further on
                      contain charge-ordering of Ni$^{1+}$/Ni$^{2+}$, opening the
                      access towards anisotropic properties.},
      cin          = {JCNS-FRM-II / JCNS-4 / JCNS-2 / JARA-FIT / MLZ},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-4-20201012 / I:(DE-Juel1)JCNS-2-20110106 /
                      $I:(DE-82)080009_20140620$ / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001132741600001},
      doi          = {10.3390/cryst13121670},
      url          = {https://juser.fz-juelich.de/record/1022220},
}