| 摘要 |
PURPOSE:To obtain a Josephson element having excellent productivity by forming a junction layer made of metal oxide having different composition ratio from that of metal oxide superconductor between electrodes made of the metal oxide superconductor. CONSTITUTION:Tertiary compound films 13, 14 having 0.5<=A+B/Cu<=2.5 of element ratio are formed of oxide containing at least A, B, Cu from adhered superconductor electrode on a crystalline substrate 11. Here, A is at least one of Sc, Y and lanthanum elements and B is at least one of group IIa elements, such as Ba, Sr, Ca, Be, Mg. The junction layer 15 of a Josephson element is composed of a layer having different composition ratio from that of a superconductor electrode and not superconductively transferred or having less critical current. Thus, a very accurate Josephson element is performed by reducing the thickness of the metal oxide superconductor and altering its composition ratio. |
