Magnetization measurements on sintered YBa2Cu3O7−y in two geometries (slab and cylinder) show the coexistence of two transport mechanisms: intergranular and intragranular currents. Both mechanisms can be explained in the framework of the critical state model. Using a simple law for the critical current versus magnetic field dependence, it is possible to calculate the magnetization and the in-phase and out-of-phase AC susceptibility and the agreement with the experimental data is good. Magnetization measurements on tubular samples have been performed too; these measurements, together with χAC measurements allow to determine the dimensions of magnetized regions.
Supercurrent lengthscale in sintered YBCO and critical state model.
PUTTI, MARINA;SIRI, ANTONIO;
1989-01-01
Abstract
Magnetization measurements on sintered YBa2Cu3O7−y in two geometries (slab and cylinder) show the coexistence of two transport mechanisms: intergranular and intragranular currents. Both mechanisms can be explained in the framework of the critical state model. Using a simple law for the critical current versus magnetic field dependence, it is possible to calculate the magnetization and the in-phase and out-of-phase AC susceptibility and the agreement with the experimental data is good. Magnetization measurements on tubular samples have been performed too; these measurements, together with χAC measurements allow to determine the dimensions of magnetized regions.
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