New type of vortex pinning structure effective at very high magnetic fields |
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Authors: | Muralidhar M Sakai N Chikumoto N Jirsa M Machi T Nishiyama M Wu Y Murakami M |
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Institution: | Superconductivity Research Laboratory (SRL), International Superconductivity Technology Center, Division III, 1-16-25, Shibaura, Minato-ku, Tokyo, 105-0023, Japan. |
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Abstract: | We report on a new type of correlated nanometer-scale pinning structure observed in a melt-processed (Nd0.33Eu0.38Gd0.28)Ba(2)Cu(3)O(y) (NEG-123). It consists of NEG/Ba-rich clusters in the stoichiometric NEG-123 matrix forming a lamellar array with a period of a few nanometers. These lamellas appear within regular twins, thus representing their fine substructure-sometimes straight, sometimes wavy. This new material structure correlates well with the significant enhancement of pinning at high fields, represented by irreversibility field above 14 T at 77 K (B parallel c). We believe that the new pinning medium enables one to significantly broaden the limits for high-field applications. |
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