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https://elib.bsu.by/handle/123456789/274037
Заглавие документа: | Superconducting critical temperature and softening of the phonon spectrum in ultrathin Nb- and NbN/graphene hybrids |
Авторы: | Prischepa, S. L. Kushnir, V. N. Cirillo, C. Granata, V. Komissarov, I. V. Kovalchuk, N. G. Mikhalik, M. M. Danilyuk, A. L. Svito, I. A. Andrulevičius, M. Attanasio, C. |
Тема: | ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика |
Дата публикации: | 2021 |
Издатель: | IOP Publishing Ltd |
Библиографическое описание источника: | Superconductor Science and Technology. – 2021.– Vol. 34 – P. 115021 – 115051 |
Аннотация: | Superconductivity is studied in hybrids consisting of ultrathin superconducting film/few layer graphene. Two different superconductors are used for this purpose, Nb and NbN. An increase in the superconducting critical temperature Tc is observed when graphene is put into contact with Nb. The largest increase is obtained for the thinnest Nb layer, which has a Tc 8% larger with respect to the single Nb film. In the case of NbN the effect is not as pronounced. Experimental data are discussed by considering the possible modification of the phonon spectrum in the superconductor due to the presence of the graphene. Within an elementary one-dimensional model based on elastic coupling between nearest-neighbor atoms, we demonstrate that the phonon spectrum in the superconductor is modified at low energies with the subsequent enhancement of the effective electron–phonon coupling constant. While the strong oscillating nature of the electron–phonon interaction, α2(ω), in NbN could lead to the insensitivity of Tc on the low-energy phonons generated by the graphene, the almost constant behavior of α2(ω) in Nb favors the increase of the superconducting critical temperature. |
URI документа: | https://elib.bsu.by/handle/123456789/274037 |
ISSN: | 0953-2048 |
DOI документа: | 10.1088/1361-6668/ac2c0e |
Лицензия: | info:eu-repo/semantics/openAccess |
Располагается в коллекциях: | Кафедра физики твердого тела и нанотехнологий (статьи) Кафедра теоретической физики и астрофизики (статьи) |
Полный текст документа:
Файл | Описание | Размер | Формат | |
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Superconducting critical temperature.pdf | 990,14 kB | Adobe PDF | Открыть |
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