| 摘要 |
PURPOSE:To facilitate controlling the characteristics with a minute current by a method wherein a superconducting electrode made of oxide superconductor and a control electrode which controls the status of a depletion layer in the superconducting electrode are provided. CONSTITUTION:A Schottky barrier is employed as a means to control a superconducting current. An oxide superconductor thin film of a K2NiF4 type structure or a provskite type crystal structure is formed on a substrate 4 made of MgO by a sputtering method and processed to form a superconducting electrode 1. Then normal-conducting metal selected among Al, Cu, Ni-Cr, Sn and In is applied to the surface of the superconducting electrode 1 by a resistance heating evaporation method and the evaporated metal is processed by a dry- etching method to form a control electrode 2. Therefore, along with the increase of a voltage applied to the control electrode 2, the width of a depletion layer formed in the superconducting electrode 1 is consecutively widened and the applied critical superconducting current is consecutively reduced. With this constitution, the superconducting current applied to both the ends of the superconductor can be modulated. |
