铜铁稀磁合金中铁磁杂质之间相互作用对低温热电势的影响  

Influence of iron impurity interaction in copper-iron dilute magnetic alloy at low temperatures

作　　者：张宇晟[1] 李敬东[2] 刘梦宇[2] 杨斌[1] 陈焕新[1] 王惠龄[1] 

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074 [2]华中科技大学电气与电子工程学院,武汉430074

出　　处：《物理学报》2015年第15期391-396,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51276070)资助的课题~~

摘　　要：本文提出在铜铁稀磁合金中高浓度铁磁杂质之间的相互作用对低温热电势的影响巨大,基于耦合杂质理论,得出了高浓度铜铁稀磁合金的热电势在4—100 K的温度范围内随温度变化的理论曲线.理论曲线与铁杂质浓度含量为0.1%(at)Fe,0.13%(at)Fe和0.15%(at)Fe原子百分比的铜铁合金热电势实验值符合,为推动低温铜铁稀磁热电偶的应用提供了理论分析基础.In the paper the coupling impurities theory is used, and both s-d interaction effect and phonon effect in dilute magnetic alloys are discussed. The Green＇s function is used to analyse the Hamiltonian of the system. In copper-iron dilute magnetic alloy the magnetic impurities interaction has a huge impact on thermoelectric power in the condition of high concentration of iron. Theoretic value of thermoelectric power of dilute magnetic copper-iron alloy with high concentration of iron changing with temperature is given. We have chosen three typical copper-iron dilute magnetic alloys and calculated the thermoelectric power under the effect of impurities and the effect of impurities interaction. Their atomic percentage concentrations are 0.1%, 0.13% and 0.15% respectively. Theoretical value of the thermoelectric power under the effect of impurities interaction in copper-iron alloy complies with experimental value. This paper provides the basic theoretical analysis for promoting the application of low-temperature copper-iron dilute magnetic thermocouple.

关 键 词：稀磁铜铁合金热电偶 磁性杂质 康多效应(Kondo effect) 低温分度特性 

分 类 号：TH811[机械工程—仪器科学与技术]