SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 44: Focus Session: Superconducting Nickelates I
TT 44.5: Invited Talk
Thursday, March 30, 2023, 11:45–12:15, HSZ 03
Superconducting layered square-planar nickelates: Synthesis, properties, and progress — •Grace Pan1, Dan Ferenc Segedin1, Harrison LaBollita2, Qi Song1, Berit Goodge3, Lena Kourkoutis3, Charles Brooks1, Antia Botana2, and Julia Mundy1 — 1Harvard University, Cambridge, MA, USA — 2Arizona State University, Tempe, AZ, USA — 3Cornell University, Ithaca, NY, USA
Since the discovery of high-Tc superconductivity in the cuprates, there have been sustained efforts to both understand the origins of this phase and discover new cuprate-like superconductors. One prime materials platform has been the rare-earth nickelates; indeed, superconductivity was discovered in the doped compound Nd0.8Sr0.2NiO2 in 2019. 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 describe the synthesis of the quintuple-layer (n=5) member, 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 fortified with experiments suggest that Nd6Ni5O12 interpolates between cuprate-like and infinite-layer nickelate-like behaviour. By engineering a distinct superconducting nickelate, we identify the square-planar nickelates as a new family of superconductors that can be tuned via both doping and dimensionality. In this talk, I will further discuss ongoing experimental progress on the synthesis and characterization of these layered nickelates.