顺磁性物质CeF_3中磁化率和费尔德常数的定量计算

Quantitative Calculation of the Magnetic Susceptibility and the Verdet Constant in the Paramagnetic Medium CeF_3

本文首先计及晶场对顺磁性物质CeF_3中Ce^(3+)离子4f基态和5d激发态能级的影响,进而考虑了间接交换作用有效场II_v和外磁场H_e共同作用下导致的晶场基态能级的进一步分裂,然后应用基态双能级跃迁模型定量计算了CeF_3中的比法拉第旋转θ_F,费尔德常数F和磁化率X以及它们与温度的依赖关系.计算表明,CeF_3中的磁光效应及其温度特性与Ce^(3+)离子之间的间接交换作用密切相关,在60<T≤300K范围内X^(-1)、(?)^(-1)与温度T成线性关系,V/X=-16032(1+68.1/T),与实验结果符合得非常好.

This paper first considers tne effect or me crystal field on both of tne 4f ground state and 5d excited state of Ce3+ ion in the paramagnetic medium CeF3, and further, takes account of the splitting of the ground state in the crystsl field caused by the effective superexchange field Hv and applied field He , and then using the model of the double transition with ground state splitting, calculates quantitatively the specific Faraday rotation θF , Verdet constant V , magnetic susceptibility X and their temperature dependence in CeF3. A theoretical calculation shows that the magneto-optical effect and its temperature dependence in CeF3 are closely related to the superexchange interaction between Ce3+ ions. V -1 is linearly dependent on T and V/X = - 16032(1 + 68. 1/T) in the temperature range 60K < T ≤ 300K. The theory is in good agreement with the experimental results.