Phase transitions, crystal growth

Formation of a multi-link conductivity hysteresis loop during phase transition in vanadium dioxide films

A. V. Ilinskiy^a, A. A. Kononov^b, E. B. Shadrin<sup>a

a</sup> Ioffe Institute, St. Petersburg
^b Herzen State Pedagogical University of Russia, St. Petersburg

Abstract: It has been shown for the first time that in the dielectric spectra of a VO$_2$ 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, VO$_2$ nanocrystalline films, dielectric spectroscopy, specific conductivity.

Received: 27.05.2025
Revised: 27.05.2025
Accepted: 29.05.2025

DOI: 10.61011/FTT.2025.06.60946.147-25

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