SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 44: Focus Session: Superconducting Nickelates I

TT 44.5: Hauptvortrag

Donnerstag, 30. März 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-T_c 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 Nd_0.8Sr_0.2NiO₂ in 2019. Undoped NdNiO₂ belongs to a series of layered square-planar nickelates with chemical formula Nd_n+1Ni_nO_2n+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 (d^8.8) 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.