Mn_2Sb_(0.95)Bi_(0.05)化合物的磁性和电输运性能  

Magnetic and electronic transport properties of Mn_2Sb_(0.95)Bi_(0.05) compound

作　　者：孙乃坤[1] 高印博[1] 杨健[1] 

机构地区：[1]沈阳理工大学理学院,辽宁沈阳110159

出　　处：《功能材料》2011年第B11期791-793,共3页Journal of Functional Materials

基　　金：沈阳理工大学博士启动基金资助项目(沈理工科[2008]20号)

摘　　要：通过首先熔炼Sb0.95Bi0.05固溶体,然后再把该固溶体和Mn一起熔炼的多步骤熔炼法,成功地制备了Mn2Sb0.95Bi0.05化合物。样品的热磁曲线测量表明在亚铁磁的Mn2Sb基体中,通过Bi对Sb的替代可以在90K附近诱发亚铁磁到反铁磁转变。与这个一级变磁转变相对应,随着温度的降低,该化合物的电阻曲线在90K附近呈现异常的向上跳跃。电阻异常变化的机理可以被归结为反铁磁态下的超级布里渊区带隙的形成。The Mn2Sb0.95Bi0.05 compound was successfully prepared by multi-step melting process.First the Sb0.95Bi0.05 solid solution was melted and then the solid solution was melted with Mn.The temperature dependence of magnetization curve shows the substitution of Bi for Sb can induce a first-order magnetic transition from the ferrimagneitc phase to a antiferromanetic one at 90K.In accordance with the magnetic transition,the resistivity first linearly decreases and then increases suddenly at the magnetic transition temperature.The anomalous electronic transport behavior can be ascribed to the formation of super-zone gap.

关 键 词：金属间化合物 变磁转变 电输运性能 巨磁电阻效应 超布里渊区能隙 

分 类 号：O482.525[理学—固体物理] O482.54[理学—物理]