Recent data on flux creep in a variety of Y-Ba-Cu-O superconductors show a temperature-independent plateau in the magnetization decay Sieq-d lnM(t)/d ln(t), with values clustered in the range S=0.020--0.035. This apparent universality in S, which appears at odds with conventional flux-creep theories, can be explained naturally if one assumes the existence of a truly superconducting ordered phase at low temperatures that has a strongly nonlinear (exponential) I-V characteristic.
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Malozemoff et al. (1990) studied this question.
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