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• W1610167134 abstract "We report on studies of magnetic and transport properties, as well as on characterization of defects in the pure ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ and the ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$/Ag(10 and 30 wt. %) composites. The studies of magnetic properties include the diamagnetic shielding, the Meissner effect, the trapped field [for both zero-field-cooling (ZFC) and field-cooling (FC) cases], and their dependence on applied magnetic field, temperature, and time. High- and low-magnetic-field hysteresis loops were measured and the intragrain ``magnetic'' critical current density was calculated. The studies of transport properties include the resistivity and intergrain ``transport'' critical-current-density measurements. Distribution, spacing, and size of intragrain twin boundaries were investigated. The results show the degradation of superconducting properties if silver is added to ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ during the sintering process, except the enhancement of the intergrain critical current density ${mathit{J}}_{mathrm{CT}}$ in ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$/Ag(10 wt. %) composite. The activation energy for intergranular flux creep of 1.6 and ensuremath{sim}0.3 eV was found for the pure ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ and the ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$/Ag composites, respectively. The results did not show any relationship between ${mathit{J}}_{mathrm{CT}}$, the activation energy, and the number of pinning centers (the trapped field) in these samples. It is suggested that the proximity junctions superconductor--normal-metal--superconductor built up by intergranular silver, and not flux pinning, are responsible for the increase of ${mathit{J}}_{mathrm{CT}}$. Defect characterization by transmission electron microscopy revealed that silver does not affect the structure of twin boundaries inside the grains of ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$." @default.
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• W1610167134 date "1990-10-01" @default.
• W1610167134 modified "2023-09-25" @default.
• W1610167134 title "Flux motion, proximity effect, and critical current density in<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></mml:mrow></mml:msub></…" @default.
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• W1610167134 doi "https://doi.org/10.1103/physrevb.42.6181" @default.
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