Oxygen tuning in bilayer nickelate thin films

ORAL

Abstract

Ambient-pressure superconductivity has recently been realized in bilayer nickelate thin films under epitaxial strain, exhibiting pronounced sensitivity to structural defects and oxygen stoichiometry. Clarifying the role of oxygen stoichiometry is therefore crucial for understanding both the superconductivity and a variety of phases observed in bulk and thin film bilayer nickelates. To systematically investigate how oxygen stoichiometry influences superconducting bilayer nickelate thin films, we improved the film crystallinity and systematically varied the oxygen content through ozone and vacuum annealing. The results demonstrate that oxygen stoichiometry serves as a key tuning knob for uncovering the relationship between structure, doping, and superconductivity in bilayer nickelates.

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Presenters

  • Yidi Liu

    • Stanford University

Authors

  • Yidi Liu

    • Stanford University

  • Bai Yang Wang

    • SLAC National Accelerator Laboratory
    • Stanford University

  • Jiarui Li

    • Stanford University

  • Yaoju Tarn

    • Stanford University

  • Lopa Bhatt

    • Cornell University

  • Berit H Goodge

    • Max Planck Institute for Chemical Physics of Solids

  • David Anthony Muller

    • Cornell University

  • Zhi-Xun Shen

    • Stanford University

  • Harold Y Hwang

    • Stanford University

  • Yijun Yu

    • Fudan University