Capacitive network near the metal insulator transition in Vanadium Dioxide

ORAL

Abstract

Recent infrared spectroscopy and transport measurements in nano-scaled junction of VO2 have revealed the existence of phase separation into metallic and insulating phases. Here we present Impedance spectroscopy measurements performed in high quality Vanadium dioxide (VO$_2$) thin films for the first time. This technique allows distinguishing between the resistive and capacitive response of the VO$_2$ films and provides the dielectric properties across the metal-insulator transition (MIT). The film capacitance exhibits an unusual increase close to the MIT which implies the formation of a capacitor network produced by the nanoscale phase separation of metallic and insulating phases. This work has been supported by AFOSR, COLCIENCIAS, CENM and Ramon y Cajal Fellowship.

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Authors

  • J.G. Ramirez

    • Universidad de los Andes

  • E.J. Patino

    • Universidad de los Andes

  • R. Schmidt

    • Universidad Complutense de Madrid

  • A. Sharoni

    • Bar-Ilan University

  • M.E. Gomez

    • Physics Department Universidad del Valle Cali, Colombia
    • Universidad del Valle

  • I.K. Schuller

    • Department of Physics and Center for Advanced Nanotechnology, University of California San Diego, La Jolla, California 92093
    • University of California, San Diego
    • Department of Physics and Center for Advanced Nanoscience, University of California San Diego, La Jolla CA 92093
    • University of California-San Diego