名义成分为La1.0Ca2.0Mn2O7锰氧化物的压阻效应
朱嘉林;刘振兴;禹日成;李凤英;靳常青
【期刊名称】《高压物理学报》 【年(卷),期】2006(020)003
【摘要】Pressure effects on electrical properties of a manganate with nominal composition La1.0Ca2.0Mn2O7,which has a layered perovskite structure as majority phase,have been investigated under hydrostatic pressures up to 1.05GPa by using a self-clamped CuBe piston-cylinder cell.An abnormal pressure effect was observed.At a pressure of 0.55GPa,a large pressure resistance effect of ≈40% was observed in a lower temperature range of 5～150K.Besides,it is found that the metal-insulator transition temperature increases at low pressure but deceases with further loading pressure.%利用低温高压电阻原位测量装置(自箝铍青铜活塞-圆筒式压砧),在0～1.05GPa静水压力范围内,对以层状钙钛矿结构为主相、名义成分为La 1.0Ca 2.0Mn2O7的锰氧化物样品进行了压阻效应研究.实验观测到异常的压阻效应.在低温5～150K范围内,压力为 0.55GPa时,样品呈现出高达40%的压阻效应,而且,金属-绝缘体相变温度在低压范围内随压力的增加而增加,但随着压力的进一步增加而减小. 【总页数】7页(230-236)
【关键词】层状钙钛矿结构锰氧化物;电阻率;压阻效应 【作者】朱嘉林;刘振兴;禹日成;李凤英;靳常青
【作者单位】中国科学院物理研究所极端条件实验室,中国科学院凝聚态物理中
名义成分为La1.0Ca2.0Mn2O7锰氧化物的压阻效应
