Abstract
We present the results of experimental studies of magnetic hysteresis in YBa 2Cu 4O 8 superconductor. The variation of magnetic critical current density with magnetic field and temperature is presented. The results are analyzed on the basis of Bean's critical state model and its various extensions. From our experimental results it is evident that J c (H) follows a power law in the field region between H I (field of full penetration) and H II (field where the remnant magnetization saturates). J c (T) varies exponentially in a limited temperature and field region. From the present results we conjecture that the magnetic critical current density follows the relation, J c(H,T) = K( H H I ) −n exp( −T T 0 ) in the field region between and H II and H II and temperature below T c /2.
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