La_(0.67)Sr_(0.33)Co_(1-x)Fe_xO_3体系的输运行为  

Transport behavior in La0.67TSr0.33Co(1-x)FexO3 system

作　　者：刘宁[1] 孙勇[1] 

机构地区：[1]中国科学技术大学结构分析开放实验室

出　　处：《材料研究学报》2003年第3期276-280,共5页Chinese Journal of Materials Research

基　　金：国家自然科学基金No.19934003

摘　　要：研究了Co位Fe掺杂对La_(0.67)Sr_(0.33)Co_(1-x)Fe_xO_3体系的电输运性质和超大磁阻效应的影响。实验结果表明:在低掺杂(x<0.1)时电阻率表现出金属性输运行为,在高掺杂(x=0.2和0.3)时则为半导体行为。Fe掺杂削弱了T_c处的MR峰值,但增加了低温下(T <<T_c)的MR值La_(0.67)Sr_(0.33)Co_(1-x)Fe_xO_3体系的磁电阻的起源可由外加磁场导致的自旋态转变来解释。The influence of Fe doping at Co-site on the electrical transport behavior and the colossal magnetoresistance of La0.67Sr0.33Co(1-x)FexO3 were investigated. The results show that the electrical resistivity of La0.67Sr0.33Co(1-x)FexO3 exhibits metal behavior in low-doped (a<0.1) samples and semiconducting behavior in high-doped (x=0.2 and 0.3) samples. Fe doping weakens the MR peak near Tc but enhances the low-temperature MR. The origin of CMR in La0.67Sr0.33Co(1-x)FexO3 system can be interpreted in terms of the spin-state transition induced by applying magnetic field.

关 键 词：材料科学基础学科 CMR效应 固相反应法 输运机制 

分 类 号：TB34[一般工业技术—材料科学与工程]