| 摘要 |
PROBLEM TO BE SOLVED: To provide a conductive characteristic-measuring apparatus of superconductive materials that can be measured by improving an energization current and an energization frequency as compared with the conventional appara tus and changing a sample temperature. SOLUTION: The measuring apparatus comprises a sample holder 1 of a superconductive material, a lead conductor 20 for energizing the sample 2, a superconductive transformer 3 where secondary side winding 3b is connected to the lead conductor and primary side winding 3b is connected to a current lead 4 for supplying current, a refrigerating machine for cooling the superconductive transformer 3 and the sample 2, and a vacuum container 7 for accommodating a low-temperature section such as the sample holder and the superconductive transformer. Additionally, as the embodiment of the above, the primary side winding 3a comprises two types of winding that can be switched by an energization frequency, one of them is made of an oxide superconductive material, and the other is made of a Litz wire of a copper material. Further, at last two refrigerating machines 5 are provided, thus individually cooling the ultrasonic transformer and the sample.
|
