New type of vortex pinning structure effective at very high magnetic fields

Muralidhar Miryala, Naomichi Sakai, N. Chikumoto, M. Jirsa, T. Machi, M. Nishiyama, Y. Wu, Masato Murakami

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Abstract

An irreversibility field of about 15 T and a critical current desity of 70 kA/cm2 at 4.5 T was achieved at 77 K (H||c axis) in the ternary melt-processed material NEG-123 with the initial Nd:Eu:Gd ratio of 33:38:28 added with 5 mol% of NEG-211. TEM analysis revealed formation of a nanoscale lamellar array in the NEG-123 matrix. In accord with that, TEM with EDX showed a slight but clear chemical ratio fluctuation in the matrix on a nanometer scale. STM maps of different parts of the NEG-123 sample with 5 mol% NEG-211 always showed rare-earth-rich clusters of 3 to 5 nm in size.

Original languageEnglish
JournalPhysical Review Letters
Volume89
Issue number23
Publication statusPublished - 2002 Dec 2
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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