Evaluation of Critical Parameters and AC Loss in Superconductors

Abstract

Procedures to measure critical parameters such as the critical temperature, T_c, the upper critical field, H_c2, the critical current, I_c, and the AC loss in practical superconductors are described. The criteria and factors which influence the evaluation of the parameters are briefly discussed. The importance of the holder in the 4 probe method which supports the sample against the Lorentz force is emphasized from the view point of strain effect. The magnetization method to measure the AC loss of a multifilamentary wire is described in detail.