Phase transitions

Semiconductor-metal phase transition in oxides of Magneli series: VO and V$_2$O$_3$

A. V. Ilinskiy, E. B. Shadrin

Ioffe Institute, St. Petersburg, Russia

Abstract: A comparative analysis of the physical parameters of strongly correlated oxides VO and V$_2$O$_3$ has been carried out. It has been established that the semiconductor-metal phase transition in both VO and V$_2$O$_3$ has a complex Mott–Peierls character. Namely, as the temperature increases in both oxides, before the Peierls abrupt structural phase transition, the Mott phase transition, which is extended in temperature, take place. It has been discussed the reason for the fact that, despite the stabilization of the semiconductor phase by high-strength $\pi$-dimers or $\sigma$-dimers, the temperatures of phase transitions are low ($T_c$ = 126 K (VO) and $T_c$ = 140 K (V$_2$O$_3$)).

Keywords: magnelis series, phase transformations, electron-electron correlations.

Received: 17.05.2022
Revised: 17.05.2022
Accepted: 22.05.2022

DOI: 10.21883/FTT.2022.10.53105.382

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