Abstract
Magnetic relaxation, with magnetic fields applied parallel to the c axis, was measured in a high-quality melt-textured YBa2Cu3Ox bar. Zero-field-cooled magnetization-versus-time data were obtained within a regime of field and temperatures dominated by single vortex pinning. The activation pinning energy U = UM was calculated from experimental data and compared to U = U0ln(Jc/J), where U, is a constant, Jc is the critical current density, and J the current density. This expression for U obtains within the individual pinning regime. A logarithmic dependence of UM on J was found, and the data indicated that a scaling function of UM, g(T/Tc) = (1−T/Tc)1/2, was appropriate for describing the single-vortex pinning regime.
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