METHOD FOR EVALUATING SUPERCONDUCTIVITY PROPERTY OF SUPERCONDUCTIVE FILM

摘要

PROBLEM TO BE SOLVED: To provide a method for sensitively, conveniently and inexpensively evaluating a superconductive film. SOLUTION: The superconductive film 1 is fixed to a scale 2. A cooling medium 4 is placed in a container 3. The superconductive film 1 is cooled and comes into a superconductive state. While a magnet 5 gradually falls, the scale 2 measures a force applied to the superconductive film 1. A distance Z between the superconductive film 1 and the magnet 5 is measured when a repulsive force changes to an attractive force. When magnetic field strength applied to the superconductive film 1 reaches a lower critical magnetic field Hc1, a magnetic flux enters into the superconductive film 1. When the magnetic flux enters the superconductive film 1, the attractive force acts on the superconductive film 1 and the magnet 5. The superconductive film with an excellent superconductive property has the small distance Z. COPYRIGHT: (C)2004,JPO&NCIPI