TUNNEL TYPE SUPERCONDUCTING JUNCTION ELEMENT AND SUPERCONDUCTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an element using a superconducing oxide material which can operate at a high temperature and having a superconducting tunnel junction characteristic by providing upper and lower superconducting elements composed mainly of a composite oxide and a barrier layer composed mainly of a specific composite oxide. SOLUTION: A block having an area of 3μm by 3μm is formed by cutting a laminated film formed on a substrate 10 by argon ion etching and a joint holding a barrier layer 13 composed mainly of a composite oxide expressed by Bi2 Am+1 Cum O2m+4 (where, A and m respectively represent one kind of alkaline earth metal and an integer of 1<=m<=4) is formed between lower and upper superconducting electrodes 11 and 12. Then a superconducting junction element is constituted by separating the electrodes 12 and 11 from each other by forming a interlayer insulating layer 14 that is a deposit of CaF2 and leading out metallic electrodes 15 from the insulating layers 14. Therefore, an element using a superconducting oxide material which can operate at a high temperature and having a high superconducting tunnel junction characteristic can be obtained.