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Josephson effect and single-particle tunneling in YBa2Cu3O7−x and YbBa2Cu3O7−x single-crystal break junctionsстатья
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 19 октября 2015 г.
- Авторы: Ponomarev Ya G., Aminov B.A., Hein M.A., Heinrichs H., Kresin V.Z., Müller G., Piel H., Rosner K., Tchesnokov S.N., Tsokur E.B., Wehler D., Winzer K., Yarygin A.V., Yusupov K.T.
- Журнал: Physica C: Superconductivity and its Applications
- Том: 243
- Номер: 1-2
- Год издания: 1995
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 167
- Последняя страница: 176
- DOI: 10.1016/0921-4534(94)02452-9
- Аннотация: We have studied the current-voltage characteristics of break junctions in single crystals of YBa2Cu3O7−x and YbBa2Cu3O7−x at helium temperature. For a YBa2Cu3O7−x Josephson junction Fiske resonances in low magnetic fields have been observed in the I(V) characteristics, thus proving the tunneling nature of the contact. The reduced velocity of the electromagnetic wave in the contact area has been calculated to be c/c0 ∼ 0.018 (c is the Swihart velocity). The ratio of the barrier thickness d1 to the relative dielectric constant of the barrier ϵ was found to be dI/ϵ ∼ 0.09 nm. In the quasiparticle tunneling regime, the YbBa2Cu3O7−x break junctions showed in some cases I(V) characteristics with a relatively small excess current at “sub-gap” voltages and a steep rise of the current at the “gap” voltage Vg = 2Δ/e. The “BCS-like” form of the observed I(V) characteristics seems to be in favor of s wave superconductivity.
- Добавил в систему: Пономарев Ярослав Георгиевич