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- W2030204830 abstract "Abstract Extensive theoretical work on the statistical summation of flux-line point pins cannot be applied in principle to the many experimental studies of pinning by large crystalline defects [dimensions larger than the flux-line-lattice (FLL) parameter]. However, qualitative similarities exist between the theory of point pins and observations of the critical current density in coarsely grained polycrystalline, cold worked and two-phase superconducting materials. A review is presented of the theory developed for understanding pinning by grain boundaries and ellipsoidal precipitates. This theory assumes contiguity of a FLL plane with the crystalline defect surface. Pinning by ellipsoidal precipitates accounts for the observed anisotropy of the critical current density in Nb containing impurity precipitates. The required alignment of a flat defect surface with a FLL layer sharply reduces the pinning effectiveness of grain boundaries and dislocation-cell walls. A new theory of thermally activated flux creep is presented, and data are presented that imply strong point pinning at dislocation-cell vertices in a cold-worked material." @default.
- W2030204830 created "2016-06-24" @default.
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- W2030204830 date "1989-03-01" @default.
- W2030204830 modified "2023-09-27" @default.
- W2030204830 title "Geometrically large flux-line pins" @default.
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- W2030204830 doi "https://doi.org/10.1016/0011-2275(89)90169-0" @default.
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