Abstract
A model which describes a low-field anomaly in the M–H loops of composite superconductors has been developed. Corresponding calculations were applied to the anomaly as it occurs in a composite system composed of NbTi filaments in a proximity-effect coupled matrix. The use of this system has allowed a very clear and unambiguous separation of the magnetization contributions of `strong' (S) and `weak' (W) superconducting elements. The low field anomaly, in the form of a difference between the shielding- and trapping-branch critical current densities ( J c) for the W-phase, and hence an asymmetric magnetization loop, takes place when the magnetization currents in the W-phase become influenced by the density of trapped flux in the S-phase. Comparison of theory and experiment gives values for the W-region J c which are in general agreement with those derived from the results of more conventional measurements.
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