CRITICAL CURRENT CONTROL METHOD OF HIGH TEMPERATURE SUPERCONDUCTING INTRINSIC JOSEPHSON JUNCTION

摘要

PROBLEM TO BE SOLVED: To provide a critical current control method of a high temperature superconducting intrinsic Josephson junction which can control adequately a critical current of an intrinsic junction by implanting ions of impurity element in copper oxide high temperature superconductor.;SOLUTION: When silicon ions are implanted in the copper oxide high temperature superconductor, strength of Josephson bonding between Cu-O existing naturally in crystal is reduced, so that the critical current of the intrinsic Josephson junction can be controlled. That is, when silicon ion implantation is not performed, voltage current characteristic of the copper oxide high temperature superconductor is as shown in Fig.1 (a). When silicon ion implantation is performed, the voltage current (c axis) characteristic changes as shown in Fig.1 (b).;COPYRIGHT: (C)2002,JPO