Freestanding Sr<sub>2</sub>IrO<sub>4</sub> nanomembranes: structural and optical properties

ORAL

Abstract

We report the structural and optical properties of nanoscale freestanding Sr2IrO4 thin film fabricated using a sacrificial water-soluble Sr3Al2O6 layer. The coherent lattice structure, phonon modes, two-magnon Raman scattering, and optical absorption spectra of the freestanding Sr2IrO4 nanomembrane are analogous to those of the layered iridate epitaxial thin-films and single crystals. Remarkably, the 3-unit-cell-thick SrIrO3 interfacial layers alleviate the formation of antiphase boundaries at the Sr2IrO4/Sr3Al2O6 interface, resulting in structurally-robust freestanding thin-film. Our experimental results show that this freestanding thin-film approach of layered oxides can provide techniques for tuning or realizing unprecedented states beyond conventional thin film methods, suggesting a pathway in achieving two-dimensional layered oxides electronics.

*We acknowledge the support of a National Science Foundation grant DMR-1454200 for thin-film synthesis and characterization.

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Presenters

  • Sujan Shrestha

    • Physics and Astronomy, University of Kentucky

Authors

  • Sujan Shrestha

    • Physics and Astronomy, University of Kentucky

  • Matthew Coile

    • Physics and Astronomy, University of Kentucky

  • Menglin Zhu

    • Department of Materials Science and Engineering, The Ohio State University
    • Material Science and Engineering, Ohio State University

  • Maryam Souri

    • Physics and Astronomy, University of Kentucky

  • Jiwoong Kim

    • Physics and Astronomy, University of Kentucky

  • Rina Pandey

    • Physics and Astronomy, University of Kentucky

  • Joe Brill

    • Physics and Astronomy, University of Kentucky

  • Jinwoo Hwang

    • Department of Materials Science and Engineering, The Ohio State University
    • Material Science and Engineering, Ohio State University

  • Jong Woo Kim

    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory

  • Ambrose Seo

    • Physics and Astronomy, University of Kentucky