MAGNETO-OPTICAL PROPERTIES OF FERROMAGNETIC CHROMIUM TRIHALIDES
MAGNETO-OPTICAL PROPERTIES OF FERROMAGNETIC CHROMIUM TRIHALIDES
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DOI：
10.1016/0022-3697(66)90148-x
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发表时间：
1966-01-01
影响因子：
4
通讯作者：
REMEIKA, JP
中科院分区：
文献类型：
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作者：
DILLON, JF;KAMIMURA, H;REMEIKA, JP
通过铁磁三卤化铬的可见光中可以观察到线偏振轴的非常大的旋转。最大的影响显然与吸收带边缘，CrBr 3，位于绿色。本文介绍了该旋转和相应的吸收带边的光谱变化。我们考虑一个由Br−离子八面体中的Cr 3+离子组成的模型，该模型受到分子场的作用。结果表明，吸收带边在CrBr 3对应于电荷转移跃迁，其中溴轨道中的电子被促进到一个轨道上的中央铬离子本地化。旋转是由于自旋-轨道耦合和三角晶场导致激发能级分裂的结果。
Very large rotations of the axis of linear polarization may be observed in visible light passing through ferromagnetic chromium trihalides. The greatest effects are apparently associated with an absorption band edge which, for CrBr3, is located in the green. This paper presents the spectral variation of that rotation and of the corresponding absorption band edge. We consider a model consisting of a Cr3+ion in an octahedron of Br−ions, subjected to a molecular field. It is shown that the absorption band edge in CrBr3corresponds to charge transfer transitions in which an electron in a bromine orbital is promoted into an obital localized on the central chromium ion. The rotation arises as a consequence of the splitting of the excited energy levels by the spin-orbit coupling and the trigonal crystal field.