To provide an electronic device such as multilayer type Josephson junction device having an IcRn product to be high enough and high performance obtained at high reproducibility.
This element is composed of a lower and upper electrodes 3 and 5 made of a copper oxide superconductor and intermediate layer 4 inserted between them. This layer 4 is composed of m layers of a Perovskite structure oxide formulated by (M)m(AR1)m-n+1 (AR2)2 (AR3)1Cu2Oy (M is element having a valence of +3 to +4 and ion radius of 0.053nm-0.072nm, AR1, AR2 and AR3 are alkali earth elements, rare earth elements or mixtures thereof, 2≤m, 0≤n<m-1, 3≤m+n, y is oxygen proportion) and contg. M in unit cells of its crystal structure and n layers of laminar Cu oxide contg. block layers formulated by (M)m(AR1)m-n+1 (AR2)2O3m+n+1-δ formed thereon.
MOTOI YUICHI
FUKUSHIMA SHIN
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