磁场对重电子金属材料CeCu_(6-x)Cd_x电阻的影响  

Effect of magnetic field on the transport properties of heavy electron compounds CeCu_(6-x) Cd_x

作　　者：姜黎霞[1] 孟继宝[2] 陈兆甲[2] 雒建林[2] 

机构地区：[1]北京联合大学基础部,北京100101 [2]中国科学院物理研究所,北京100080

出　　处：《物理学报》2005年第4期1777-1782,共6页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :10 0 740 80 )资助的课题~~

摘　　要：介绍了重电子金属CeCu6 -xCdx(x=0 10 ,0 15 ,0 2 0 ,0 30 ,0 5 0 )在 1 8— 30 0K温度范围内 ,在磁场 (μ0 H =0 ,5 ,10T)下电阻随温度的变化规律及低温 (1 9,15K)下的磁电阻 (μ0 H =0— 10T) .实验表明所有样品在零场下的Tmax(对应于电阻极大值的温度 )都低于 1 8K .加磁场后 ,Tmax随磁场和掺杂量x的增加明显向高温方向变化 .此外 ,各样品的磁电阻在 1 9K全是负值 ,温度升高到 15K以后 ,磁电阻有变为正值的趋势 .从近藤散射和相干散射的角度对这一现象的物理机制进行了分析 .We report the low-temperature resistance under a magnetic field (mu(0) H = 0, 5 and 10 T) within the temperature range from 1.8 to 300 K and low temperature (T = 1.9 and 15 K) magneto-resistance (mu(0)H = 0-10 T) of heavy electron compounds CeCu6-xCdx (x = 0.10, 0.15, 0.20, 0.30, 0.50). The experiments show that the T-max( corresponding to the maximal resistance) of all samples are not observed over 1.8 K under zero magnetic field. When a magnetic field is applied, the T-max increases with increasing magnetic field and doping content x. Meanwhile, the magneto- resistances are all negative at 1.9 K and the positive magneto- resistance of part of samples is observed at 15 K. This phenomenon can be explained by Kondo scattering and coherent scattering.

关 键 词：重电子金属 低温电阻 近藤散射 相干散射 磁电阻 

分 类 号：TG113[金属学及工艺—物理冶金]