Resistive relaxation in field-induced insulator-metal transition of a (La₀.₄Pr₀.₆)₁.₂Sr₁.₈Mn₂O₇ bilayer manganite single crystal

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We have investigated the resistive relaxation of a (La₀.₄Pr₀.₆)₁.₂Sr₁.₈Mn₂O₇ single crystal, in order to examine the slow dynamics of the field-induced insulator to metal transition of bilayered manganites. The temporal profiles observed in remanent resistance follow a stretched exponential function accompanied by a slow relaxation similar to that obtained in magnetization and magnetostriction data. We demonstrate that the remanent relaxation in magnetotransport has a close relationship with magnetic relaxation that can be understood in the framework of an effective medium approximation by assuming that the first order parameter is proportional to the second order one.