Dielectric Spectroscopy of Strongly Correlated Electronic States of Vanadium Dioxide
- Авторы: Il’inskii A.V.1, Kastro R.A.2, Nikulin E.I.1, Shadrin E.B.1
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Учреждения:
- Ioffe Institute
- Herzen State Pedagogical University
- Выпуск: Том 63, № 6 (2018)
- Страницы: 851-856
- Раздел: Physics of Nanostructures
- URL: https://journal-vniispk.ru/1063-7842/article/view/201521
- DOI: https://doi.org/10.1134/S1063784218060129
- ID: 201521
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Аннотация
The thermal evolution of the conductivity of a VO2 film and database-obtained band gap Eg of film nanocrystallites is traced in the temperature range of –196°C < T < 100°C (77 K < T < 273 K); the level position of donor impurity centers is determined to be Ed = 0.04 eV. It is shown that energy Eg decreases from 0.8 to ∼0 eV with an increase in temperature in the range of 273 K < T < 300 K, which is caused by the narrowing of the energy gap due to correlation effects and considered as the temperature-extended Mott “insulator–metal” electron phase transition with the monoclinic lattice symmetry retained. The subsequent jump in the symmetry from monoclinic to tetragonal with a further increase in temperature is considered as the Peierls structural phase transition, the temperature of which is in the vicinity of 340 K and determined by the size effects, nonstoichiometry of VO2 film nanocrystallites, and degree of their adhesion to the substrate.
Об авторах
A. Il’inskii
Ioffe Institute
Автор, ответственный за переписку.
Email: ilinskiy@mail.ioffe.ru
Россия, St. Petersburg, 194021
R. Kastro
Herzen State Pedagogical University
Email: ilinskiy@mail.ioffe.ru
Россия, St. Petersburg, 191186
E. Nikulin
Ioffe Institute
Email: ilinskiy@mail.ioffe.ru
Россия, St. Petersburg, 194021
E. Shadrin
Ioffe Institute
Email: ilinskiy@mail.ioffe.ru
Россия, St. Petersburg, 194021
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