Titanium monoxide (TiO): an exceptional member of 3d transition-metal monoxides

ORAL

Abstract

The 3d transition-metal monoxides (3d-TMOs) with rock-salt structure, including TiO, VO, (CrO), MnO, FeO, CoO, NiO, and (CuO), have been studied for decades for their strongly correlated electrons. Besides the non-stable CrO and CuO, titanium monoxide (TiO), an important member of 3d-TMOs, has not been studied in the stoichiometric single-crystal form. It has been challenging to prepare stoichiometric TiO due to the highly reactive Ti2+. We report the successful growth of single-crystalline TiO(001) film using molecular beam epitaxy. This enables a first-time study of stoichiometric TiO in the thin film form, showing TiO is metal but in proximity to Mott insulating state. Remarkably, we also observe a transition to the superconducting phase at a low temperature. Our findings leave single-crystalline TiO film the only metal and superconductor among 3d-TMOs.

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Presenters

  • Fengmiao Li

    • Quantum Matter Institute, University of British Columbia
    • University of British Columbia
    • Quantum Matter Institute

Authors

  • Fengmiao Li

    • Quantum Matter Institute, University of British Columbia
    • University of British Columbia
    • Quantum Matter Institute

  • Yuting Zou

    • Institute of Physics, Chinese Academy of Sciences

  • Myung-Geun Han

    • Brookhaven National Laboratory

  • Kateryna Foyevtsova

    • Quantum Matter Institute, University of British Columbia

  • Hyungki Shin

    • Quantum Matter Institute, University of British Columbia
    • University of British Columbia
    • Department of Physics and Astronomy, University of British Columbia

  • Sangjae Lee

    • Yale University

  • Chong Liu

    • Quantum Matter Institute, University of British Columbia
    • University of British Columbia

  • Kidae Shin

    • Yale University

  • Stephen D Albright

    • Yale University

  • Ronny Sutarto

    • Canadian Light Source
    • Canadian Light Source, Saskatoon, SK S7N 2V3, Canada

  • Feizhou He

    • Canadian Light Source
    • Canadian Light Source, Saskatoon, SK S7N 2V3, Canada

  • Bruce Davidson

    • Quantum Matter Institute, University of British Columbia
    • University of British Columbia
    • Quantum Matter Institute

  • Frederick Walker

    • Yale University

  • Yimei Zhu

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory
    • Condensed Matter Physics & Materials Science Department, Brookhaven National Lab
    • Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory
    • Condensed Matter Physics, Brookhaven National Laboratory

  • Zhigang Cheng

    • Institute of Physics, Chinese Academy of Sciences

  • Ilya Elfimov

    • Quantum Matter Institute, University of British Columbia
    • University of British Columbia

  • George Albert Sawatzky

    • Quantum Matter Institute, University of British Columbia
    • University of British Columbia
    • Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, Canada

  • Ke Zou

    • Quantum Matter Institute, University of British Columbia
    • University of British Columbia
    • Department of Physics and Astronomy, University of British Columbia