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MoRe/YBCO Josephson junctions and π-loopsстатья
- Авторы: Faley M.I., Reith P., Satrya C.D., Stolyarov V.S., Folkers B., Golubov A.A., Hilgenkamp H., Dunin-Borkowski R.E.
- Журнал: Superconductor Science and Technology
- Год издания: 2020
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- DOI: 10.1088/1361-6668/ab7053
- Аннотация: We have developed Josephson junctions between the d-wave superconductor YBa2Cu3O7-x (YBCO) and the s-wave Mo0.6Re0.4 (MoRe) alloy superconductor (ds-JJs). Such ds Josephson junctions are of interest for superconducting electronics making use of incorporated π-phase shifts. The I(V)-characteristics of the ds-JJs demonstrate a twice larger critical current along the [100] axis of the YBCO film compared to similarly-oriented ds-JJs made with a Nb top electrode. The characteristic voltage IcRn of the YBCO-Au-MoRe (YBCO-MoRe) ds-JJs is 750 μV at 4.2 K. The ds-JJs that are oriented along the [100] or [010] axes of the YBCO film exhibit a 200-times higher critical current than similar ds-JJs oriented along the [110] axis of the same YBCO film. A critical current density Jc = 20 kA/cm2 at 4.2 K was achieved. Different layouts of π-loops based on the novel ds-JJs were arranged in various mutual coupling configurations. Spontaneous persistent currents in the π-loops were investigated using scanning SQUID microscopy. Magnetic states of the π-loops were manipulated by currents in integrated bias lines. Higher flux states up to ±2.5Φ0 were induced and stabilized in the π-loops. Crossover temperatures between thermally activated and quantum tunneling switching processes in the ds-JJs were estimated. The demonstrated ability to stabilise and manipulate states of π-loops paves the way towards new computing concepts such as quantum annealing computing.
- Добавил в систему: Столяров Василий Сергеевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Faleyetal_2020_Supercond._Sci._Technol._10.1088_1361-6668_a… | Faleyetal_2020_Supercond._Sci._Technol._10.1088_1361-6668_a… | 1,6 МБ | 30 января 2020 [Stolyarov] | |
| 2. | Полный текст | Faleyetal_2020_Supercond._Sci._Technol._10.1088_1361-6668_a… | 1,6 МБ | 30 января 2020 [Stolyarov] |