巡游电子系统中局域磁矩之间的有效耦合分析  

The effective couple analysis between local magnetic moments in itinerant-electronic system

作　　者：郑勇林[1] 

机构地区：[1]重庆涪陵师范学院物理系,涪陵408003

出　　处：《原子与分子物理学报》2006年第2期305-309,共5页Journal of Atomic and Molecular Physics

基　　金：重庆涪陵师范学院院级重点学科建设基金(2003148);涪陵师范学院科研(05flsy047);重庆市教委科研(kj041301)

摘　　要：用渐近逼近方法分析了巡游电子系统中局域矩之间的有效耦合,在这结果的基础上,确定了耦合特征之间的关系,也就是它的信号、强度、范围和这个系统的电子结构的详细而明确的特征.我们发现耦合振荡为原子间距离的函数,并有确定的周期,且由沿材料晶向自旋向上和自旋向下的费米面的最大维度所决定.耦合的相位和振幅被系统的电子结构、电子自旋向上或自旋向下的费米面的几何特征所约束.至于耦合的范围,在有限温度时它将按指数规律衰减,在T=0 K时预期按1/R3ij衰减.The approach method with an asymptotic approximation, has been analyzed the effective coupling of between local magnetic moments in Itinerant-Electronic System. on the foundation of this result, Have determined the relation between couple feature, it＇s detailed and definite feature of signal, strength, scope and this systematic electronic structure. We discover that couple vibration has been the function of the interatomic distance , and has definite period, which are determined by the extremal dimension of up- and down-spin Ferni surface of the materals along each crystalline direction, the Phase and the amplitude of couple are restrained by the electronic structural and specific property of system, especially the geometry feature of Femi surface of the up- and down-spin. As to the range of the coupling, it is expected to decay of index law in limited temperature, and it is expected as 1/Rij^3 at T=0 K.

关 键 词：铁磁材料 巡游电子 交换耦合 

分 类 号：O481.1[理学—固体物理]