Atomic hydrogen doping in single-crystal vanadium dioxide

ORAL

Abstract

Vanadium dioxide is a strongly correlated material with a bulk metal-to-insulator transition (MIT) near 340 K. Previous experiments in single-crystal nanowires (J. Wei et al., Nature Nano. 7, 357-362 (2012)) have shown that catalytic doping with atomic hydrogen can stabilize the high temperature metallic state. In this experiment, we used a hot filament source to split hydrogen molecules and directly dope atomic hydrogen into VO2 material, including epitaxial films and nanowires, without any catalyst. From observations of the wire samples, we infer the relative diffusion rates of H in the monoclinic and rutile crystal structures. Transport measurements of the doped film samples show no temperature-driven transition, but rather a conducting state down to 2K. We present Hall and magnetoresistance measurements on macroscale and mesoscale devices fabricated from the doped films.

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Authors

  • Heng Ji

    Department of Physics and Astronomy, Rice University

  • W.J. Hardy

    Applied Physics Graduate Program, Rice Quantum Institute, Department of Physics and Astronomy, Rice University

  • J. Wei

    Department of Physics and Engineering Physics, Tulane University, Tulane University, Department of Physics, New Orleans, LA 70118

  • Jian Lin

    Department of Chemistry, Rice University

  • Hanjong Paik

    Department of Materials Science and Engineering, Cornell University

  • Darrell Schlom

    Cornell University, Department of Materials Science and Engineering, Cornell University, Cornell Univ, Department of Materials Science and Engineering, Cornell University,, Department of Materials Science and Engineering Cornell University, USA

  • Douglas Natelson

    Department of Physics \& Astronomy, Rice University, Department of Physics, Rice University, Department of Physics and Astronomy, Rice University, Rice University, Department of Physics and Astronomy, 6100 Main St., Houston, TX 77005, Department of Physics and Astronomy, Rice Univ, Rice U