New Type of Vortex Pinning Structure Effective at Very High Magnetic Fields
- 13 November 2002
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 89 (23), 237001
- https://doi.org/10.1103/physrevlett.89.237001
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.Keywords
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