Abstract
We have studied the field dependence of the zero-field-cooled magnetization of granular Y-Ba-Cu-O samples of different packing factors (between 10% and 80%). We discuss the competition between the demagnetizing factors of the sample, N, and that of the grains, n. Applying the Clausius-Mossotti approximation, we suggest a phenomenological model to treat the experimental results. According to the model the effective demagnetizing factors Neff depend on the fraction of shielded volume, which is itself a field-dependent quantity. At low fields, Neff approach N and n for highly compact and dilute samples, respectively. The suggested analysis enables the distinction and characterization of the different contributions to the total volume of the sample.
Original language | English |
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Pages (from-to) | 14823-14829 |
Number of pages | 7 |
Journal | Physical Review B |
Volume | 46 |
Issue number | 22 |
DOIs | |
State | Published - 1992 |