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- W2009847573 abstract "Abstract The magnetic-field angle dependence of the critical current density J c ( H , θ ) was measured over a wide temperature range (20–85 K) in high- J c YBa 2 Cu 3 O 7 (YBCO) and DyBa 2 Cu 3 O 7 (DyBCO) epitaxial films belonging to two categories. The films in the first category were prepared by thermal co-evaporation and were characterized by a high density of nanometer-sized precipitates (mostly ab -plane. Relatively broad J c ( θ ) peaks around H // ab in the shape of a stratovolcano were observed at 77–80 K in the co-evaporated YBCO and DyBCO films in the first category, and the J c ( H , θ ) data were scaled to be a single curve when plotted against scaled fields using an effective anisotropy parameter. However, the J c ( θ ) curves became more gradual at 60–70 K and the scaling behavior was broken because the radius of nano-precipitates was not sufficiently smaller than the temperature dependent Ginzburg–Landau coherence length ξ ( T ) at these temperatures. In contrast, sharp J c ( θ ) peaks around H // ab were observed in the FF-MOD YBCO films in the second category at all temperatures in the range 20–85 K. Anisotropic scaling analysis showed that the pinning was apparently due to small random pins and pins correlated with the ab -plane, and the linear pins whose radius is sufficiently smaller than ξ ( T ) can cause the observed J c ( H , θ ). The temperature dependence of J c due mainly to the random pinning was approximately ∼(1 − T / T c ) 2 (1 + T / T c ) 2 for the FF-MOD thin films (dislocation pins), which is consistent with a simple theoretical model based on core pinning interactions. The T dependence of J c for the co-evaporated films (nano-precipitate pins) was ∼(1 − T / T c ) m (1 + T / T c ) 2 ( m = 2.1–2.6), which deviates from m = 2.5 expected from the simple theoretical model because nano-precipitates are not sufficiently smaller than ξ ( T ) at T ⩽ 70 K." @default.
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- W2009847573 date "2012-08-01" @default.
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- W2009847573 title "Temperature dependence of magnetic-field angle dependent critical current density and the flux pinning in YBa2Cu3O7 thin films" @default.
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- W2009847573 doi "https://doi.org/10.1016/j.physc.2012.03.027" @default.
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