Temperature and Magnetic Field Dependence of the Critical Current in Polycrystalline Ba2YCu3Oy
Temperature and magnetic field dependence on the critical current density J c of polycrystalline high-T c oxide superconductor, Ba 2 YCu 3 O y , have been measured. In the low magnetic field range, 0.6 ~ 7 kOe, the J c behavior changed at around 70 K. Below 70 K, J c showed different temperature dependence between field cooling and zero-field cooling, that is, the J c value measured when the sample was cooled in a fixed magnetic field, was different from that measured when the sample was cooled in zero magnetic field and then a magnetic field was applied. Above 70 K, however, such different temperature dependence on J c was not observed. These experimental results can be attributed to the effects of anisotropy, and a crossover between the two-and three-dimensional superconductivity is considered to occur.
KeywordsCritical Current Density Magnetic Field Dependence Field Cool Oxide Superconductor Dimensional Crossover
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- W. Lawrence and S. Doniach: Proc. Int. Conf. on Low-Temperature Physics., Kyoto, 1971 (Academic Press of Japan, Kyoto, 1971) p.361.Google Scholar
- K. Kanoda, T. Kawagoe, M. Hasumi, T. Takahashi, S. Kagoshima and T. Mizoguchi: preprint.Google Scholar