Abstract
Current-voltage (IV) characteristics of REBa2Cu3O7-δ have been used to extract critical current density (JcG and Jc) using an electric field (E) criterion below the onset critical temperature (Tc). By changing the intrinsic magnetic moment via four different rare earth (RE) atoms the interlayer coupling between superconducting planes is modified strongly. Variations of granular critical current density (JcG (T)) and total critical current density (Jc) are used to extract an exponent which we propose to be important to understand the nature of the vortex pinning by distributed magnetic moments. Also the effect of the grain boundary angles on pinning exponents extracted from both Jc (T) and JcG (T) has been discussed.
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