π-Loops with ds josephson junctions
| Autor: | Igor A. Golovchanskiy, Hans Hilgenkamp, V. S. Stolyarov, Rafal E. Dunin-Borkowski, Pim Reith, Michael Faley, Alexandre Avraamovitch Golubov |
|---|---|
| Přispěvatelé: | Interfaces and Correlated Electron Systems |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Josephson effect
Superconductivity superconducting quantum interference devices (SQUIDs) Materials science High-temperature superconductivity Josephson junctions Condensed matter physics scanning probe microscopy Condensed Matter Physics 01 natural sciences Magnetic flux quantum computing Electronic Optical and Magnetic Materials Magnetic field law.invention SQUID Scanning probe microscopy law High-temperature superconductors 0103 physical sciences Half-integer Electrical and Electronic Engineering 010306 general physics |
| Zdroj: | IEEE transactions on applied superconductivity, 29(5):8606963. IEEE |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/tasc.2019.2892078 |
| Popis: | 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 I c and the I c R n 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. |
| Databáze: | OpenAIRE |
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