Formation of a multi-link conductivity hysteresis loop during phase transition in vanadium dioxide films
Ilinskiy A.V.1, Kononov A.A.2, Shadrin E.B.1
1Ioffe Institute, St. Petersburg, Russia
2Herzen State Pedagogical University of Russia, St. Petersburg, Russia
Email: shadr.solid@mail.ioffe.ru, kononov_aa@icloud.com
It has been shown for the first time that in the dielectric spectra of a VO2 nanocrystalline film, the Mott (electronic) component of the Mott-Peierls thermally stimulated phase transition manifests itself in the form of a monotonic increase in the frequencies of the features of the dielectric spectra on the heating branch and a decrease in their frequencies on the cooling branch of the thermal hysteresis loop. At the same time, the Peierls (structural) component manifests itself in the form of a redistribution of intensities between the monoclinic and tetragonal components of the fine structure of the dielectric spectra with a simultaneous monotonic change in the frequency position of the fine structure features, forming a multi-link nature of the hysteresis loop of the complex phase transition of conductivity. Keywords: vanadium dioxide, semiconductor-metal phase transition, VO2 nanocrystalline films, dielectric spectroscopy, specific conductivity.
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