Pan, GraceFerenc Segedin, DanLaBollita, HarrisonSong, QiNica, Emilian M.Goodge, Berit H.Pierce, Andrew T.Doyle, SpencerNovakov, SteveCórdova Carrizales, DenisseN'Diaye, Alpha T.Shafer, PadraicPaik, HanjongHeron, John T.Mason, Jarad A.Yacoby, AmirKourkoutis, Lena F.Erten, OnurBrooks, Charles M.Botana, Antia S.Mundy, Julia A.2023-12-122021-11-22Pan, Grace, Dan Ferenc Segedin, Harrison LaBollita, Qi Song, Emilian M. Nica, Berit H. Goodge, Andrew T. Pierce et al. "Superconductivity in a quintuple-layer square-planar nickelate." Nat. Mater. 21, no. 2 (2021): 160-164. DOI: 10.1038/s41563-021-01142-91476-11221476-4660https://nrs.harvard.edu/URN-3:HUL.INSTREPOS:37377503Since the discovery of high-temperature superconductivity in copper oxide (cuprate) materials, there has been sustained efforts to both understand the origins of this phase and discover new cuprate-like superconducting materials. One prime materials platform has been the rare-earth nickelates and indeed superconductivity was recently discovered in the doped compound Nd0.8Sr0.2NiO2. Undoped NdNiO2 belongs to a series of layered square-planar nickelates with chemical formula Ndn+1NinO2n+2 and is known as the ‘infinite-layer’ (n = ∞) nickelate. Here, we report the synthesis of the quintuple-layer (n = 5) member of this series, Nd6Ni5O12, in which optimal cuprate-like electron filling (d8.8) is achieved without chemical doping. We observe a superconducting transition beginning at ∼13 K. Electronic structure calculations, in tandem with magnetoresistive and spectroscopic measurements, suggest that Nd6Ni5O12 interpolates between cuprate-like and infinite-layer nickelate-like behavior. In engineering a distinct superconducting nickelate, we identify the square-planar nickelates as a new family of superconductors which can be tuned via both doping and dimensionality.en-USMechanical EngineeringMechanics of MaterialsCondensed Matter PhysicsGeneral Materials ScienceGeneral ChemistryJournal Article2023-12-1210.1038/s41563-021-01142-9