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000860441 1001_ $$0P:(DE-Juel1)130633$$aFaley, M. I.$$b0$$eCorresponding author
000860441 245__ $$aπ-Loops With ds Josephson Junctions
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000860441 520__ $$aWe 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.
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000860441 7001_ $$0P:(DE-HGF)0$$aReith, P.$$b1
000860441 7001_ $$0P:(DE-HGF)0$$aStolyarov, V. S.$$b2
000860441 7001_ $$0P:(DE-HGF)0$$aGolovchanskiy, I. A.$$b3
000860441 7001_ $$0P:(DE-HGF)0$$aGolubov, A. A.$$b4
000860441 7001_ $$0P:(DE-HGF)0$$aHilgenkamp, H.$$b5
000860441 7001_ $$0P:(DE-Juel1)144121$$aDunin-Borkowski, R. E.$$b6
000860441 773__ $$0PERI:(DE-600)2025387-4$$a10.1109/TASC.2019.2892078$$gVol. 29, no. 5, p. 1 - 5$$n5$$p1 - 5$$tIEEE transactions on applied superconductivity$$v29$$x1051-8223$$y2019
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