Nd-Ba-Cu-Oバルク超電導体におけるNd422非超電導相のピン止め効果

抄録

The flux pinning properties of Nd₄Ba₂Cu₂O₁₀ (Nd422) inclusions in Nd-Ba-Cu-O bulk superconductors has been studied. The temperature and field dependence of critical current density as well as magnetization relaxation have been studied for various Nd-Ba-Cu-O samples. Nd422 inclusions are effective not only in increasing critical current density in a low-field region, but also in enhancing the irreversibility field (B_irr) and reducing flux creep even in relatively high fields.