SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 44: Focus Session: Superconducting Nickelates I

TT 44.1: Hauptvortrag

Donnerstag, 30. März 2023, 09:30–10:00, HSZ 03

Atomic-scale insights to lattice and electronic structure in superconducting nickelates — •Berit Goodge — School of Applied and Engineering Physics, Cornell University — Kavli Institute at Cornell for Nanoscale Science, Cornell University — Max Planck Institute for Chemical Physics of Solids

Although the synthesis of superconducting nickelates [1,2] remains notoriously challenging [3,4], many materials realities including epitaxial strain, extended defects, impurities, and secondary phases are largely undiscussed in the context of understanding their measured properties. As direct probes of lattice and electronic structure down to the atomic scale, scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS) offer unique insights to build a holistic understanding of both the intrinsic physical properties in these materials as well as more extrinsic features and their consequences, many of which arise from their multistep synthesis. Here, we discuss how quantitative lattice-scale measurements can disentangle many of these effects, revealing, for example, multi-band hole interactions [5], nontrivial interface reconstruction [6], and the impact of epitaxial strain [2, 7].
[1] Li et al., Nature 572, 624 (2019)
[2] Lee et al., arXiv:2203.02580 (2022)
[3] Lee et al., APL Mat. 8:4, 041107 (2020)
[4] Pan et al., Nat. Mat. 21, 160 (2022)
[5] Goodge et al., PNAS 118:2, (2021)
[6] Goodge et al., arXiv:2201.03613 (2022)
[7] Segedin et al., under review (2022)