Superconductivity in Epitaxial RuO<sub>2</sub> (100) Films grown via Hybrid MBE

ORAL

Abstract

RuO2, which is non-superconducting in bulk, exhibits superconductivity under epitaxial strain along specific crystallographic directions. In this talk, we report the growth of high-quality, epitaxial RuO2 (100) thin films on TiO2 (100) substrates using hybrid MBE with a pre-oxidized precursor, Ru(acac)3 . This approach overcomes the challenges of low Ru vapor pressure and oxidation potential, enabling epitaxial film growth in the presence of oxygen plasma. By tuning film thickness to control strain, we investigate the emergence of superconductivity and correlate it with structural and electronic properties using X-ray diffraction, Scanning Transmission Electron Microscopy, Optical Spectroscopy, and milli-Kelvin transport measurements.

*AFOSR through Grant Nos. FA9550-21-1-0025 and FA9550-23-1-0247

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Presenters

  • Anand Santhosh

    • University of Minnesota

Authors

  • Anand Santhosh

    • University of Minnesota

  • Seung Gyo Jeong

    • University of Minnesota
    • University of Minnesota, Twin Cities

  • Zhifei Yang

    • University of Minnesota
    • University of Minnesota Twin Cities

  • Weideng Sun

    • University of Minnesota

  • Hyo Seok Kim

    • Gwangju Institute of Science and Technology

  • Bita Pourbahari

    • McMaster University

  • Junghyun Koo

    • University of Minnesota

  • Nabil Bassim

    • McMaster University

  • Jong Seok Lee

    • Gwangju Institute of Science and Technology

  • Gang Qiu

    • University of Minnesota

  • Bharat Jalan

    • University of Minnesota