庞磁阻材料电磁特性同步测量的实验

大学物理 ›› 2013, Vol. 32 ›› Issue (10): 35-35.

庞磁阻材料电磁特性同步测量的实验

李朝荣崔益民李华

北京航空航天大学物理教学与实验中心,北京100191

出版日期:2013-10-25 发布日期:2013-10-20

The co - measurements of electrical and magnetic properties of colossal magnetoresistance materials

Online:2013-10-25 Published:2013-10-20

摘要/Abstract

摘要： 以La2/3Ca1/3MnO3材料为试样,通过电阻和磁化率随温度变化曲线的同步测量,让学生了解该类钙钛矿结构材料的超巨磁电阻特性（或庞磁阻）（CMR,Colossal Magnetoresistance）以及决定这种特性的双交换作用机理（double exchange）,观测绝缘-金属转变和顺磁-铁磁转变,理解金属-绝缘转变和铁磁居里转变的对应关系,认识庞磁阻效应的本质.

关键词: CMR, 绝缘-金属转变, 顺磁-铁磁转变, 双交换作用

Abstract: The electrical and magnetic properties of the perovskite La 2 /3 Ca 1 /3 MnO 3 are measured at the same time,in which colossal magnetoresistance and mechanism of double exchange are found.Transitions of insulator metal and paramagnetic-ferromagnetic are observed simultaneously,so interactions of electrical and magnetic in those materials are understood more easily.

Key words: CMR, insulator-metal transition, paramagnetic-ferromagnetic transition, double exchange

中图分类号:

O436.1

李朝荣崔益民李华. 庞磁阻材料电磁特性同步测量的实验[J]. 大学物理, 2013, 32(10): 35-35.