【作者】 周智辉； 杨昌平； 邓恒； 郭定和；

【Author】 ZHOU Zhi-hui YANG Chang-ping DENG Heng GUO Ding-he (The Provincial Key Laboratory of Piezoelectric Ceramics Materials and Apparatus,Faculty of Physics and Electronic Technology,Hubei University,Wuhan 430062,China)

【机构】 湖北大学物理学与电子技术学院铁电压电材料与器件湖北省重点实验室；

【摘要】 用固相烧结法制备 Nd_0．67Sr_0．33MnO_y（y=2．85） 多晶样品．样品输运性质表现出自旋相关电致电阻特征．对含量低于化学计量 y=3．0样品,当温度高于某一特征温度时,电阻变化符合线性欧姆定律：但低于这一特征温度时,电阻大小与负载电流或电压有关,Ⅰ-Ⅴ曲线偏离线性规律；在绝缘体-导体相转变点附近,样品电阻随负载电流或电压增大而迅速减小,表现出巨大电致电阻效应．这种自旋相关的电致电阻行为与氧含量和界面有很大关系．更多还原

【Abstract】 Spin-dependent electroresistance（ER）effect was found in polycrystalline Nd_0.67Sr_0.33MnO_y（y=2.85）sample, which were synthesized using solid-state reaction method.For Nd_0.67Sr_0.33MnO_y（y=2.85）sample with oxygen-deficient, I-V characteristic is linear when temperature is above a certain point.However,below the critical temperature,electrical resistance strongly depends on load current or voltage and decreases remarkably with increasing the load.The spin-dependent ER effect was explained based on the oxygen-deficient and grain boundary.更多还原