We have systematically studied the role of (Formula presented) (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 (Formula presented) even in a high-field region and thus the irreversibility field (Formula presented) Three pinning regimes have been identified at elevated temperatures (Formula presented) K): a combination of point and interface pinning in low fields; a combination of interface and (Formula presented) pinning in intermediate fields; and interface pinning with a slight influence from (Formula presented) pinning in high fields. Nd422 addition shifted the boundary of the pinning regime to higher fields. We have found overall (Formula presented) is almost a simple summation of two contributions: interface pinning and (Formula presented) pinning.
|Number of pages||11|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2000 Jan 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics