This title appears in the Scientific Report :
2019
Please use the identifier:
http://dx.doi.org/10.1109/TASC.2019.2892078 in citations.
π-Loops With ds Josephson Junctions
π-Loops With ds Josephson Junctions
We fabricated Josephson junctions (JJs) between the d-wave superconductor (SC) YBa 2 Cu 3 O 7 -x (YBCO) and the s-wave SC Nb (ds-JJs) on graphoepitaxially buffered MgO substrates, studied ds-JJs at temperatures down to 30 mK and employed these JJs in π-loops. Current-voltage characteristics of ds-JJ...
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Personal Name(s): | Faley, M. I. (Corresponding author) |
---|---|
Reith, P. / Stolyarov, V. S. / Golovchanskiy, I. A. / Golubov, A. A. / Hilgenkamp, H. / Dunin-Borkowski, R. E. | |
Contributing Institute: |
Mikrostrukturforschung; PGI-5 |
Published in: | IEEE transactions on applied superconductivity, 29 (2019) 5, S. 1 - 5 |
Imprint: |
New York, NY
IEEE
2019
|
DOI: |
10.1109/TASC.2019.2892078 |
Document Type: |
Journal Article |
Research Program: |
Controlling Configuration-Based Phenomena Controlling Collective States |
Publikationsportal JuSER |
We fabricated Josephson junctions (JJs) between the d-wave superconductor (SC) YBa 2 Cu 3 O 7 -x (YBCO) and the s-wave SC Nb (ds-JJs) on graphoepitaxially buffered MgO substrates, studied ds-JJs at temperatures down to 30 mK and employed these JJs in π-loops. Current-voltage characteristics of ds-JJs oriented along the [100] axis of YBCO exhibited up to a factor of 200 higher critical current densities than ds-JJs oriented along the [110] axis of YBCO. The critical current Ic and the IcRn product of [100]-oriented 3 μm wide ds-JJs are ∼70 μA and ∼200 μV, respectively, at 4.2 K. Rectangular arrays of up to 40 000 π-loops based on such ds-JJs were investigated using a low temperature scanning superconducting quantum interference device (SQUID) microscope. We observed ordering of spontaneously generated half integer magnetic flux quanta in the π-loops correlated with minute spurious background magnetic fields, as well as with configurations and mutual coupling of the π-loops. We manipulated the magnetic states of the π-loops by the local application of magnetic fields using nearby planar coils. This paper paves the way for the use of π-loops in computations that are based on annealing processes. |