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

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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.

Original languageEnglish
Pages (from-to)1350-1360
Number of pages11
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number2
Publication statusPublished - 2000
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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