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Granular superconductivity effects in a polycrystalline sample ofruthenocuprate RuSr$_2$(Gd$_{1.5}$Ce$_{0.5})$Cu$_2$O$_{10-\delta}$ are studied.The main attention has been devoted to manifestation of these effects incurrent and magnetic-field dependences of resistive transition tosuperconducting state. It is found that current dependences of differentialresistance taken at different temperatures intersect strictly at two definitevalues of current demonstrating crossing point effect. This phenomenon has beenexplained taking into account inhomogeneous state of intergrain medium whichcan be considered as a two-component system. The particular attention has beengiven to magnetoresistance (MR) hysteresis in mixed state of this inhomogeneoussystem and to influence of applied current and temperature on this phenomenon.Two types of hysteresis (clockwise and anticlockwise) have been found withtransition from clockwise to anticlockwise hysteresis with increasingtemperature. Stepwise structure in MR hysteretic curves has been observed inlow-field range. Possible reasons of the change in hysteresis behavior withincreasing temperature and appearance of the stepwise structure in MR curvesare discussed taking into consideration inhomogeneous state of the granularsuperconductor studied.

Hysteresis and stepwise structure in MR curves of granular superconducting ruthenocuprates RuSr$_2$(Gd$_{1.5}$Ce$_{0.5})$Cu$_2$O$_{10-\delta}$}