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| 001 | 873062 | ||
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| 037 | _ | _ | |a FZJ-2020-00511 |
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| 100 | 1 | _ | |a Faley, M. I. |0 P:(DE-Juel1)130633 |b 0 |e Corresponding author |
| 245 | _ | _ | |a MoRe/YBCO Josephson junctions and π -loops |
| 260 | _ | _ | |a Bristol |c 2020 |b IOP Publ. |
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| 520 | _ | _ | |a 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 I c R n of the YBCO–Au–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 J c = 20 kA cm−2 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. |
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| 773 | _ | _ | |a 10.1088/1361-6668/ab7053 |g Vol. 33, no. 4, p. 044005 - |0 PERI:(DE-600)1361475-7 |n 4 |p 044005 - |t Superconductor science and technology |v 33 |y 2020 |x 0953-2048 |
| 856 | 4 | _ | |y OpenAccess |u https://juser.fz-juelich.de/record/873062/files/Faley_2020_Supercond._Sci._Technol._33_044005.pdf |
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