Magnetization of Gd diffused YBa2Cu3O7-x superconductor:Experiment and theory

摘要

The magnetization of Gd diffused YBa2Cu3OT-x is measured by a vibrating sample magnetometer (VSM) at selected temperatures (5,25,50,77 K).The experimental results for the magnetization are analyzed in the critical state framework involving Kim-Anderson field dependence Jc(H) =Jc0/(1 + |H|/Ho)n of critical current density and equilibrium magnetization Meq.It is found that the inclusion of the equilibrium magnetization becomes more important at higher temperatures.At 77 K,the shape of the isothermal M-H hysteresis curve is governed by the equilibrium magnetization.Some superconducting parameters are determined by fitting the calculated curves to the experimental data.