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- W2014256906 abstract "Magneto-optical (MO) imaging has been used to visualize and calculate magnetic flux and current distributions at temperatures T ranging from 7 to 80 K in thin-film [001] tilt ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ bicrystals with misorientation angles 3ifmmode^circelsetextdegreefi{}ensuremath{le}ensuremath{theta}ensuremath{le}10ifmmode^circelsetextdegreefi{}. A characteristic cusp in the flux distribution ${mathit{B}}_{mathit{z}}$(x,y) was observed for 5ifmmode^circelsetextdegreefi{}ensuremath{le}ensuremath{theta}ensuremath{le}7ifmmode^circelsetextdegreefi{}, which is shown to indicate that the critical current density ${mathit{J}}_{mathit{b}}$ across the boundary is smaller than the intragrain ${mathit{J}}_{mathit{c}}$. We use the Bean model for thin-film superconductors to calculate the observed features of the ${mathit{B}}_{mathit{z}}$(x,y) distribution and to separate both the intragrain ${mathit{J}}_{mathit{c}}$ and intergrain ${mathit{J}}_{mathit{b}}$(ensuremath{theta}) independently from the MO data. The study of angular and temperature dependencies of ${mathit{J}}_{mathit{b}}$(T,ensuremath{theta}) in bicrystals with different ensuremath{theta} shows that ${mathit{J}}_{mathit{b}}$(ensuremath{theta}) strongly decreases with ensuremath{theta} above ensuremath{theta}ensuremath{approxeq}5ifmmode^circelsetextdegreefi{}. The decrease of ${mathit{J}}_{mathit{b}}$(T,ensuremath{theta}) with temperature becomes weaker as the misorientation angle ensuremath{theta} is increased, so the substantial difference in ${mathit{J}}_{mathit{b}}$ for 5ifmmode^circelsetextdegreefi{} and 7ifmmode^circelsetextdegreefi{} boundaries at low T turns out to be less pronounced at liquid-nitrogen temperatures. In addition, the ratio ${mathit{J}}_{mathit{b}}$(ensuremath{theta},T)/${mathit{J}}_{mathit{c}}$(T) for low-angle grain boundaries is shown to exhibit an anomalous increase with T, thus indicating that the grain boundaries can provide additional flux pinning. This is plausibly associated with the grain boundary dislocations that accommodate the misorientation of the grains. textcopyright{} 1996 The American Physical Society." @default.
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- W2014256906 date "1996-04-01" @default.
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- W2014256906 title "Magneto-optical study of flux penetration and critical current densities in [001] tilt<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></…" @default.
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- W2014256906 doi "https://doi.org/10.1103/physrevb.53.8687" @default.
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