Studies of magnetization currents in YBa2Cu3O7−x superconductors

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Abstract
The trapped magnetic field of melt‐textured Y‐Ba‐Cu‐O samples has been studied. The measured field distributions can be well reproduced by a simple two‐current model consisting of a constant surface current and a constant volume current. If the sample is maximally magnetized (saturated case), the remnant sample magnetic moment can be calculated from the two‐current model, and the results agree with vibrating sample magnetometer measurements to typically 10%. Jc of the sample can then be obtained. The application of the two‐current model to the analysis of the nonsaturated case is also reported, for both field‐cooled and zero‐field‐cooled samples. The experimental data show the general features predicted by the Bean model, which, however, has to be modified to account for the data quantitatively.