La5/8-xPr xCa3/8MnO3体系电输运特性的研究

低温物理学报 , 2005, 27(z1): 486-492. doi: 10.3969/j.issn.1000-3258.2005.z1.019

La5/8-xPr xCa3/8MnO3体系电输运特性的研究

杨聚刚 ^1, , 敬超 ^2, , 曹桂新 ^3, , 杨勇 ^4, , 曹世勋 ^5, , 张金仓 ^6,

1.上海大学物理系,上海,200444

2.上海大学物理系,上海,200444

3.上海大学物理系,上海,200444

4.上海大学物理系,上海,200444

5.上海大学物理系,上海,200444

6.上海大学物理系,上海,200444

基金项目: 上海市教委资助项目上海市科委资助项目(04JC14039) 中国科学院资助项目(10274049) 上海市教委"曙光计划"(03SG35)

关键词： La5/8-xPrxCa3/8MnO3 , 电阻极小值现象 , 磁电阻

STUDY OF ELECTRICAL TRANSPORT FOR La5/8-xPrxCa3/8MnO3SYSTEM

对La5/8-xPrxCa3/8MnO3(x＝0,0.13,0.20,0.25)体系的电输运特性进行了系统研究.结果表明随着Pr含量的增大金属-绝缘转变温度(TMI)减小,在高于TMI的温度区域,该体系的电输运行为具有绝缘体特性,符合可变程跳跃模型;而在较低温度(50 K以下),其电阻率存在极小值现象,且随磁场的增大而逐渐受到抑制.对这种电阻率极小值现象从强电子-电子相互作用角度进行了分析讨论.

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La5/8-xPr xCa3/8MnO3体系电输运特性的研究

STUDY OF ELECTRICAL TRANSPORT FOR La5/8-xPrxCa3/8MnO3SYSTEM

参考文献