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• W1497374027 abstract "$mathrm{RE}$Ba${}_{2}$Cu${}_{3}$O${}_{x}$ (REBCO) films can achieve remarkably high critical current density ${J}_{c}$ values by the incorporation of insulating nanoparticles. A particularly interesting case concerns BaZrO${}_{3}$ (BZO) nanorods which strongly enhance ${J}_{c}$ at high temperatures and fields up to a few tesla. Here we investigate the full angular transport ${J}_{c}$ over a much broader range of field (up to 31 T) and temperature (4.2--77 K), a range suitable for new very high field magnet applications. We show that the correlated $c$-axis pinning of BZO nanorods becomes progressively less obvious at lower temperatures and indeed at 4.2 K up to 31 T, the only visible correlated pinning is for fields parallel to the film plane. ${J}_{c}$ at 4.2 K is still, however, strongly enhanced by the BZO nanorods, as is clearly manifested by a remarkably high bulk pinning force density ${F}_{p}$ ensuremath{approx} 900 GN/m${}^{3}$ for $H$ensuremath{Vert}$c$, because the BZO nanorods add weak but very dense pins which contribute up to half of ${J}_{c}$ in the low temperature limit. Above about 30 K these dense but weak pins lose their effectiveness and ${J}_{c}$ then becomes dominated by the sparse but strong BZO pins. This strong temperature dependence of the dominant pinning effects of multiple pin types makes broad range characterization essential to reveal the great flexibility of pinning in modern REBCO films that is almost certainly not yet fully optimized." @default.
• W1497374027 created "2016-06-24" @default.
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• W1497374027 date "2012-09-13" @default.
• W1497374027 modified "2023-10-17" @default.
• W1497374027 title "Role of weak uncorrelated pinning introduced by BaZrO<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>nanorods at low-temperature in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mi mathvariant=normal>Y</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant=normal>Gd</mml:mi></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:math>Ba<mml:math xmlns:…" @default.
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• W1497374027 doi "https://doi.org/10.1103/physrevb.86.115416" @default.
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