Flux pinning by Nd4Ba2Cu2O10 inclusions in NdBa2Cu3O7−δ superconductors: A combined effect of point, interface, and Δκ pinning at elevated temperatures
Tadashi Mochida, Noriko Chikumoto, Masato Murakami
DOI 10.1103/PhysRevB.62.1350 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93.8 | Pressure not reported | onset |
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94.5 | Pressure not reported | onset |
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | onset |
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