Simulation of Irreversibility line of thin superconducting disk in perpendicular magnetic fields

الملخص EN

Simulation of a theoretical model for the real and imaginary parts of part susceptibility of superconducting thin disk as a function of temperature at different perpendicular applied magnetic field were effectuated.

Matlab codes were written to compute this model.

During these calculations, the critical current density was assumed independent of the applied magnetic field (that is according to Bean critical state model).

The susceptibility parts as a function of temperature were calculated at different disk thickness and at different applied perpendicular magnetic fields.

It was found that the temperature corresponding to the peak of the imaginary part of the susceptibility (Irreversibility temperature) nonlinearly increases as the disk thickness increases.

From the temperature dependent susceptibility at different applied magnetic field, the Irreversibility line ( ) was obtained and found to follow the expression .

The results of using the ac susceptibility model showed agreement with experimental works by others.