Abstract
Recent data on flux creep in a variety of Y-Ba-Cu-O superconductors show a temperature-independent plateau in the magnetization decay {ital S}{identical to}{minus}{ital d} ln{ital M}({ital t})/{ital d} ln({ital t}), with values clustered in the range {ital S}=0.020--0.035. This apparent universality in {ital 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) {ital I}-{ital V} characteristic.
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