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@ARTICLE{Faley:873062,
author = {Faley, M. I. and Reith, P. and Satrya, C. D. and Stolyarov,
V. S. and Folkers, B. and Golubov, A. A. and Hilgenkamp, H.
and Dunin-Borkowski, R. E.},
title = {{M}o{R}e/{YBCO} {J}osephson junctions and π -loops},
journal = {Superconductor science and technology},
volume = {33},
number = {4},
issn = {0953-2048},
address = {Bristol},
publisher = {IOP Publ.},
reportid = {FZJ-2020-00511},
pages = {044005 -},
year = {2020},
abstract = {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.},
cin = {PGI-5 / ER-C-1},
ddc = {530},
cid = {I:(DE-Juel1)PGI-5-20110106 / I:(DE-Juel1)ER-C-1-20170209},
pnm = {144 - Controlling Collective States (POF3-144)},
pid = {G:(DE-HGF)POF3-144},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000537735500002},
doi = {10.1088/1361-6668/ab7053},
url = {https://juser.fz-juelich.de/record/873062},
}