用具有磁反馈的de Haas-van Alphen效应研究铅传导电子的轨道自旋劈裂因子  

ORBITAL SPIN-SPLITTING FACTORS FOR CONDUCTION ELECTRONS IN LEAD: DE HAAS-VAN ALPHEN STUDIES WITH MAGNETIC FEEDBACK

作　　者：任燕如[1] 

机构地区：[1]北京师范大学物理系

出　　处：《物理学报》1989年第10期1559-1568,共10页Acta Physica Sinica

基　　金：加拿大自然科学与工程研究委员会部分资助

摘　　要：本文运用磁反馈技术,通过测量de Haas-van Alphen振荡的谐波振幅的相对强度,详细研究了金属铅中传导电子在费密面极值轨道上的自旋劈裂因子g_c。作者特别强调了样品的非均匀性对磁反馈技术的影响。文中给出了在磁场平行于[100],[110],[111]三个高对称方向上费密面各极值轨道上的g_c实验值。这些g_c值在0.71至1.147之间,与自由电子的g值有较大偏离。作者认为这是强自旋-轨道耦合和强电子-声子相互作用的结果。Using the magnetic feedback technique, a detailed experimental study has been made on the spin-splitting factors g_c associated with the conduction electrons in extremal orbits on the Fermi surface of lead, by measuring the relative strengths of the harmonic amplitudes of the de Haas-van Alphen waveform. Particular attention has been paid to the influence of sample inhomogeneity. Experimental g_c values are given for most of the extremal orbits on the lead Fermi surface for high-symmetry directions of [100] , [110] , and [111] of the magnetic field. These g-c values are found to span the range from 0.71 to 1.147. The large deviation from the free-electron value are consequences of strong spin-orbit and electron-phonon interactions.

关 键 词：铅 传导电子 磁反馈 dHvA效应 

分 类 号：TG146.12[一般工业技术—材料科学与工程]