压力对巨磁阻材料La_(2/3)Ca_(1/3)MnO_(3+δ)物性的影响  

PRESSURE EFFECTS ON MAGNETIC PROPERTIES OF La_(2/3)Ca_(1/3)MnO_(3+δ) THIN FILMS

作　　者：刘振兴[1] 费扬[2] 孟宪仁 黄康权[2] 

机构地区：[1]中国科学院物理研究所和凝聚态物理中心,北京100080 [2]香港中文大学物理系 [3]北京师范大学物理系,北京100875

出　　处：《高压物理学报》2000年第3期161-165,共5页Chinese Journal of High Pressure Physics

摘　　要：研究了不同含氧量LaCaMnO的压力效应 ,发现随压力的增加富氧样品电阻率的变化和相变温度的改变都比较小。同时还对照研究了压力与磁场对材料的影响 ,发现压力对整个温区的电阻都有明显的影响 ,而磁场仅对相变温度附近温区有明显的影响 ,这从实验上证实了两者有着不同的作用机制。Pressure effects on LaCaMnO thin films were studied experimentally.The results show that the resistivity and transition temperature of rich oxygen samples are not sensitive to pressure.Based on the experimental results on the effects of pressure and temperature on CMR LaCaMnO samples,it is found that pressure also has effects on resistivity in the whole temperature range,but the magnetic field just affects the resistivity around transition temperature. [WT5HZ]

关 键 词：载流子 铁磁相变 压力 巨磁阻材料 物性 

分 类 号：O521.21[理学—高压高温物理] TM27[理学—物理]