粒状超导铌铜酸盐RuSr曲线中的滞后和台阶结构
Hysteresis and stepwise structure in MR curves of granular superconducting ruthenocuprates RuSr$_2$(Gd$_{1.5}$Ce$_{0.5})$Cu$_2$O$_{10-δ}$}
摘要：
本文研究了六元铜酸盐RuSr $_2$（Gd $_{1.5}$ Ce $_{0.5})$ Cu $_2$ O $_{10-δ}$）多晶样品的颗粒超导电性效应。主要的注意力一直致力于表现出这些影响的电流和磁场的依赖性的电阻过渡到超导状态。发现不同温度下微分电阻随电流的变化关系在两个确定的电流值处严格相交，表现出交叉点效应。这一现象已被解释考虑到晶粒间介质的非均匀状态，可以被认为是一个两个组件系统。特别关注了该非均匀系统混合状态下的磁电阻（MR）滞后以及施加电流和温度对这种现象的影响。两种类型的滞后（顺时针和逆时针）已被发现与过渡从顺时针到逆时针滞后随着温度的升高。在低场范围内，观察到了MR迟滞曲线的阶梯结构。考虑到所研究的颗粒超导体的非均匀状态，讨论了磁滞行为随温度升高而变化以及MR曲线中出现阶梯结构的可能原因。
英文摘要：
Granular superconductivity effects in a polycrystalline sample of ruthenocuprate RuSr$_2$(Gd$_{1.5}$Ce$_{0.5})$Cu$_2$O$_{10-δ}$ are studied. The main attention has been devoted to manifestation of these effects in current and magnetic-field dependences of resistive transition to superconducting state. It is found that current dependences of differential resistance taken at different temperatures intersect strictly at two definite values of current demonstrating crossing point effect. This phenomenon has been explained taking into account inhomogeneous state of intergrain medium which can be considered as a two-component system. The particular attention has been given to magnetoresistance (MR) hysteresis in mixed state of this inhomogeneous system and to influence of applied current and temperature on this phenomenon. Two types of hysteresis (clockwise and anticlockwise) have been found with transition from clockwise to anticlockwise hysteresis with increasing temperature. Stepwise structure in MR hysteretic curves has been observed in low-field range. Possible reasons of the change in hysteresis behavior with increasing temperature and appearance of the stepwise structure in MR curves are discussed taking into consideration inhomogeneous state of the granular superconductor studied.
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