纳米金属镝的传导电子定域化

研究不同粒径的稀土金属镝(Dy)纳米晶块体材料的电阻率随温度的变化. 电阻率包括剩余电阻率ρ_res=ρ(0)、磁散射电阻率ρ_mag(T)和声子散射电阻率ρ_pho(T). 样品的平均粒径分别为10,30,100和1000 nm. 实验发现磁散射电阻率ρ_mag(T)和声子散射电阻率ρ_{pho 关键词： 镝金属电性 定域化 能带论 无序}

Localization of conduction electrons in nanometer metal Dy

The Changes of resistivity with temperature of bulk nanocrystalline metal dysprosium samples with different grain sizes were studied in this paper. The value of the resistivity is a sum of the residual rsistivity ρ_res=ρ (0), magnetic scatter resistivity ρ_mag(T) and phonon scatter resistivity ρ_pho(T). The mean grain sizes are 10 nm, 30 nm, 100 nm and 1000 nm. It was experimentally found that the magnetic scatter resistivity ρ_mag(T) and phonon scatter resistivity ρ_pho(T) increase as temperature increases. The measured values of the resistivities of the four samples are in the range of (0.8—252)×10^-8Ω ·m, representing metalloid features. Experiments also showed that the residual rsistivity ρ (0) of the sample with 10nm mean grain size is about 98.6×10^-8Ω ·m, which is about one order of magnitude greater than those of the other three samples. This is an experimental example of the energy band narrowing and the appearance of electron localization with the increase of disorder degree.