轴向形变钠团簇的轨道磁性：从剪刀模到双顺磁各向异性
Orbital magnetism in axially deformed sodium clusters: From scissors mode to dia-para magnetic anisotropy
摘要：
研究了碱金属团簇中的低能轨道磁偶极激发，即剪刀模（SM）。随后的动态和静态效果进行了探讨。的治疗是基于一个自洽的微观方法，使用的离子背景和Kohn-Sham平均场的电子的jeltron近似。讨论了SM的微观起源及其主要特征（轻团簇和中等团簇中模式的结构、低能和高能等离子体激元的分离、高能M1剪刀和E2四极等离子体激元的耦合、形状异构体的贡献等）。剪刀M1强度随着簇大小的增加而获得大的值。该模式是负责的范Vleck顺磁性的自旋饱和集群。量子壳层效应导致Langevin抗磁性和van Vleck顺磁性之间的脆弱相互作用，并导致特殊轻团簇的磁化率具有显著的双对位各向异性。最后，讨论了几种实验观测SM的途径。
英文摘要：
Low-energy orbital magnetic dipole excitations, known as scissors mode (SM), are studied in alkali metal clusters. Subsequent dynamic and static effects are explored. The treatment is based on a self-consistent microscopic approach using the jellium approximation for the ionic background and the Kohn-Sham mean field for the electrons. The microscopic origin of SM and its main features (structure of the mode in light and medium clusters, separation into low- and high-energy plasmons, coupling high-energy M1 scissors and E2 quadrupole plasmons, contributions of shape isomers, etc) are discussed. The scissors M1 strength acquires large values with increasing cluster size. The mode is responsible for the van Vleck paramagnetism of spin-saturated clusters. Quantum shell effects induce a fragile interplay between Langevin diamagnetism and van Vleck paramagnetism and lead to a remarkable dia-para anisotropy in magnetic susceptibility of particular light clusters. Finally, several routes for observing the SM experimentally are discussed.
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