We have systematically studied the role of Nd4Ba2Cu2O10 (Nd422) nonsuperconducting inclusions for flux pinning in oxygen-controlled-melt-growth processed Nd-Ba-Cu-O bulk superconductors. Nd422 inclusions act as interface pinning which is the most dominant in low-field and high-temperature region. In addition, they are also effective in enhancing the critical current density (Jc) even in a high-field region and thus the irreversibility field (Birr). Three pinning regimes have been identified at elevated temperatures (T≥77 K): a combination of point and interface pinning in low fields; a combination of interface and Δκ pinning in intermediate fields; and interface pinning with a slight influence from Δκ pinning in high fields. Nd422 addition shifted the boundary of the pinning regime to higher fields. We have found overall Jc is almost a simple summation of two contributions: interface pinning and Δκ pinning.
|Number of pages||11|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2000|
ASJC Scopus subject areas
- Condensed Matter Physics