Abstract
It is shown that an excess of free electrons occurs in hydrogenated films of vanadium sesquioxide compared to non-hydrogenated films. This leads to a shift of the temperature hysteresis loops of the insulator-metal thermal phase transition to the low-temperature region, i.e., to a decrease in the critical temperature Tc of the phase transition. The interpretation of the results is based on the fact that V2O3 is a highly correlated material, and the phase transition in it has a complex character: the Mott electronic transition initiates the Peierls structural transition. It is shown that the atoms of embedded hydrogen are localized on oxygen ions forming additional σ-bonds with them, the thermal destruction of some of which leads to an increase in the concentration of free electrons in conduction band of hydrogenated V2O3 films.
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Il’inskii, A.V., Nikulin, E.I. & Shadrin, E.B. Mechanism of Hydrogen Effect on the Phase Transition in V2O3 Films. Phys. Solid State 63, 714–721 (2021). https://doi.org/10.1134/S1063783421050097
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DOI: https://doi.org/10.1134/S1063783421050097