Abstract
Magnetization studies on a melt textured-growth sample of YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] have tested several theoretical models to see which of them best describes the relaxation of supercurrents in this high-[ital T][sub [ital c]] superconductor. By combining conventional flux-creep experiments with measurements of magnetization versus magnetic-field sweep rate, we are able to detect the decay of magnetization in both its intermediate and very early stages, thereby expanding the observational window up to 5--6 decades of time. Among four recent models tested, only vortex-glass--collective-pinning theory consistently describes both stages. The resulting values for the characteristic exponent [mu] strongly depend on temperature and magnetic field. Values for the effective hopping time for vortices, [ital t][sub [ital e][ital f][ital f]], are [similar to]0.1 s.
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