Abstract
Transport critical current density J C( T, B, θ) of screen-printed, c-axis-oriented (Bi,Pb) 2Sr 2Ca 2Cu 3O x /Ag composite tape with a ceramics mono-layer core was investigated between 4.5 and 77 K in magnetic fields up to 8 T as a function of the field angle θ between B and the c axis. At low temperatures T ⪕ 30 K , a shift of a peak angle from θ = 90° (i.e., B ⊥ c axis) occurs in the J C versus θ curve, accompanied by an additional asymmetry. Such anomalies are explained by the history effect in the J C values on magnetic field for B∥ c axis ascribed to the grain-boundary weak links, on the assumption that J C is dominated by the field component B ∥ = Bcos θ parallel to the c axis. At elevated temperatures, disappearance of the history effect results in a perfectly symmetrical angular dependence of J C with a peak at θ = 90°.
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