BICRYSTAL OXIDE SUPERCONDUCTING FILM AND HIGH TEMPERATURE SUPERCONDUCTING JOSEPHSON JUNCTION ELEMENT AND SUPERCONDUCTING QUANTUM INTEFERENCE ELEMENT USING IT

摘要

PROBLEM TO BE SOLVED: To provide a high temperature Josephson junction element exhibiting critical current-magnetic field characteristics different from the Fraunhofer pattern of Josephson junction in the s-s wave junction of a metal based superconductor. SOLUTION: The high temperature Josephson junction element employs a bicrystal oxide superconductor where two grains forming the junction interface of a bicrystal oxide superconducting film 6 formed on a bicrystal substrate 3 are c-axis oriented grains and the boundary interfaces of these two grains are 110} face and 100} face or 010} face. Superconducting critical current exhibits a minimal value of substantially 0 under 0 magnetic field and repeats maximal and minimal values periodically as the absolute value of magnetic field increases.