晶场二级效应与交换作用对PrF3晶体磁性及磁光性质的影响

研究了晶场二级效应在PrF₃晶体中的作用，发现该效应可使Pr³⁺离子的晶场单态与其他态混合，对PrF₃晶体磁化率产生明显影响.进一步研究了晶体内的交换作用有效场，其形式为H_in=(1.9-0.02556T)×10^-5M，在100—300 K的温度范围内，以此计算的PrF₃晶体的倒数磁化率和Verdet常数的倒数与实验值符合较好.结果表明，在PrF₃晶体中，晶场二级效应与离子间的交换作用都不能忽略. 关键词： 晶场二级效应 交换作用有效场 Verdet常数 3晶体')" href="#">PrF₃晶体

Effect of the secondary crystal field-effect and the exchange interaction on magnetic and magneto-optic properties of PrF3

In the PrF₃ crystal, the lowest crystal field state of Pr³⁺ ion is a single state, which has no contribution to the susceptibility and the Verdet constant of the crystal in first-order effect. The secondary crystal field-effect admixes the state with other states and makes the state have a great contribution to the magnetic properties of PrF₃ crystal. In this paper, the effect of secondary crystal field-effect on the magnetic and magnetio-optic properties of PrF₃ crystal is presented. Furthermore, the effective field of exchange interaction between the ions is investigated, which has the form is H_in=(1.9-0.02556 T)×10^-5M. By means of the effective field, the inverses of the magnetic susceptibility and Verdet constant of PrF₃ crystal as functions of temperature are calculated, and the results are in good agreement with the measured ones. The results show that the crystal field's second-order contribution and exchange interaction between ions shouldn't be ignored.