Cr_(75)Fe_xMn_(25-x)(x=16,18)合金的热导  

THERMAL CONDUCTIVITY OF Cr 75 Fe x Mn 25-x ( x =16,18) ALLOYS 

作　　者：吴柏枚[1] 杨东升[1] 盛松[1] 徐未名[2] 陈兆甲[2] 

机构地区：[1]中国科学技术大学物理系 [2]中国科学院低温技术实验中心

出　　处：《物理学报》1999年第6期1147-1151,共5页Acta Physica Sinica

基　　金：高等学校博士学科点专项科研基金

摘　　要：测量了Ｃｒ７５ＦｅｘＭｎ２５－ｘ（ｘ＝１６，１８）合金的热导和电导，温度范围为７７—３００Ｋ．在ＳＤＷ反铁磁转变附近观察到热导率温度曲线斜率的改变和电导率极大，这与反铁磁转变过程中能隙的打开有关．对合金低温热导率结果的分析处理指出。Abstract The thermal conductivity and the electrical conductivity of Cr 75 Fe x Mn 25-x ( x =16,18) alloys have been measured over the temperatures range from 77K to 300K. The change of slope on thermal conductivity temperature curve and the maximum on electrical conductivity temperature curve have been found near the transition temperature of spin density wave type antiferromagnetism, which is related to the opening of the energy gap. Both alloys exhibit a rise in the phonon thermal conductivity with decreasing temperature as being characteristic of umklapp processes.

关 键 词：铬铁锰合金 热导 电导 SDW 反铁磁转变 

分 类 号：TG111.92[金属学及工艺—物理冶金] TG131[金属学及工艺—金属学]