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• W1968643145 abstract "${mathrm{NdBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ single crystals and melt-textured samples were prepared in reduced atmospheres starting from the Nd-poor side of the phase diagram in order to minimize the Nd/Ba substitution and the second phase content. Current density $j$ and irreversibility field ${B}_{mathrm{irr}}$ were measured as a function of temperature and angle between the $c$ axis and applied field direction in samples with different impurity and oxygen contents. Current density vs field shows a pronounced peak effect which results from small clusters of oxygen vacancies, whereas a second peak is related to the twin structure. The current density at 77 K is for fields up to 4 T above $4ifmmodetimeselsetexttimesfi{}{10}^{4}A/{mathrm{cm}}^{2}$ and reaches values of $1.2ifmmodetimeselsetexttimesfi{}{10}^{5}A/{mathrm{cm}}^{2}$ in the peak at 2.1 T. The irreversibility fields parallel to the $c$ axis reach 13.4 and 11.8 T at 77 K in pure and homogeneous single crystals and melt-textured samples, respectively. These extremely high values, which are caused by the twin structure, decrease to 10 and 8 T, respectively, if the current is optimized. The correlation and interference between $j$ and ${B}_{mathrm{irr}}$ in the presence of weakly and strongly interacting defects such as small clusters of oxygen vacancies and Nd-422 precipitates, respectively, as well as the influence of the twin structure are analyzed and discussed." @default.
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• W1968643145 date "1997-09-01" @default.
• W1968643145 modified "2023-09-27" @default.
• W1968643145 title "High irreversibility fields and current densities in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>NdBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:…" @default.
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• W1968643145 doi "https://doi.org/10.1103/physrevb.56.6308" @default.
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