Josephson oscillation linewidth of ion-irradiated YBa$_2$Cu$_3$O$_7$ junctions

Авторы: Sharafiev A., Malnou M., Feuillet-Palma C., Ulysse C., Febvre P., Lesueur J., Bergeal N.
Журнал: Superconductor Science and Technology
Том: 29
Номер: 7
Год издания: 2016
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Аннотация: We report on the noise properties of ion-irradiated YBa2Cu3O7 Josephson junctions. This work aims at investigating the linewidth of the Josephson oscillation with a detector response experiment at 132 GHz. Experimental results are compared with a simple analytical model based on the Likharev–Semenov equation and the de Gennes dirty limit approximation. We show that the main source of low-frequency fluctuations in these junctions is the broadband Johnson noise and that the excess (1/f) noise contribution does not prevail in the temperature range of interest, as reported in some other types of high-Tc superconducting Josephson junctions. Finally, we discuss the interest of ion-irradiated junctions to implement frequencytunable oscillators consisting of synchronized arrays of Josephson junctions.
Добавил в систему: Шарафиев Алексей Владимирович

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