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VOLUME 51 (1990) | ISSUE 4 | PAGE 225
Electromagnetic properties of ceramic high-Tc superconductor in critical state
A method is proposed for directly measuring the critical current density /,, of a ceramic high-Fc superconductor as a function of the magnetic field Η through the use of a low-frequency electromagnetic signal as a probe. In a model of the critical state, the surface impedance of a ceramic sample is proportional to the function