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TT: Fachverband Tiefe Temperaturen
TT 5: Nickelates I
TT 5.14: Vortrag
Montag, 18. März 2024, 13:00–13:15, H 3007
Strain engineering of superconducting infinite-layer nickelates — •Berit Goodge1,2, Dan Ferenc Segedin3, Grace Pan3, Charles Brooks3, Julia Mundy3, and Lena Kourkoutis1 — 1Cornell University, Ithaca, USA — 2Max Planck Institute CPfS, Dresden, Germany — 3Harvard University, Cambridge, USA
The superconducting monovalent layered nickelates demonstrate a key example of successful materials prediction and design based on proximity to a related system, namely the superconducting cuprates. The metastable nickel valence corresponding to the requisite electronic configuration, however, results in a complex synthetic route to stabilize these compounds involving high-quality thin film synthesis of higher-valent nickelate epitaxial thin films followed by topotactic chemical reduction to the desired square-planar phase. This two-step processes introduces competing epitaxial strain states in the precursor and target phases, which present both immense challenges as well as unique possibilities to leverage these strain interactions for bespoke tuning of the resulting film structure. Here we discuss both the limits to and possibilities for strain engineering in superconducting nickelates.
Keywords: scanning transmission electron microscopy; Ruddlesden-Popper phases; epitaxial strain; molecular beam epitaxy; thin films