SUPERCONDUCTIVE JOSEPHSON JUNCTION, METHOD OF ITS PREPARATION, AND ITS USE IN SQUIDS

摘要

A superconductive Josephson junction device comprising a substrate layer (3) having at least one layer of a superconductive ceramic material (2) comprising at least a first (2a) and a second (2b) superconductive crystal; said first and second crystals being joined in at least one grain boundary (1) which forms a Josephson junction; wherein the grain boundary has a reduced content of oxygen exhibiting a normal resistance which is larger than that of a fully oxidized grain boundary; a method of its preparation; use of such Josephson junction devices in a superconductive quantum interference device; a method of preparing a superconductive quantum interference device; and an integrated multilayered superconductive quantum interference device.