Microscopic theory of the second-order magnetoelectric susceptibility in the optical region: Case of boracite Co 3 B 7 O 13 I
Microscopic theory of the second-order magnetoelectric susceptibility in the optical region: Case of boracite Co 3 B 7 O 13 I
复制标题
光学区二阶磁电化率的微观理论：以方硼石Co 3 B 7 O 13 I为例
DOI：
10.1103/physrevb.65.045103
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发表时间：
2001
影响因子：
3.7
通讯作者：
B. Krichevtsov
中科院分区：
文献类型：
--
作者：
A. Zyuzin;B. Krichevtsov
本文提出了在光学区二阶磁电磁化率的微观理论，并讨论了硼酸盐Co 3 B 7 O 1 3 I中Co2+离子态间的光学跃迁。利用Co2+离子在四重对称D2 d晶场中的多粒子波函数，考虑自旋-轨道相互作用和塞曼相互作用，得到了一个在光频下的二阶磁电磁化率的表达式，该表达式考虑了基态Kramers二重态的布居，在宽的温度范围内是有效的.这两个分裂的Kramers双峰的基态和激发态和磁场的依赖性的电和磁偶极子矩阵元素有助于这种敏感性。Co 3 B 7 O 1 3 I的色散、温度依赖性和非互易双折射的绝对值的实验数据可以在所考虑的模型中充分描述。
The microscopic theory of second-order magnetoelectric susceptibility in the optical region is presented for the case of optical transitions between states of Co 2 + ions in boracite Co 3 B 7 O 1 3 I. Using many particle wave functions of the Co 2 + ion in the crystal field of tetragonal symmetry D 2 d and accounting for spin-orbit and Zeeman interactions we obtain an expression for the second-order magnetoelectric susceptibility at optical frequencies, which takes into account the population of all Kramers doublets of the ground state and is valid in a wide temperature range. Both the splitting of Kramers doublets of the ground and excited states and the magnetic field dependence of electric and magnetic dipole matrix elements contribute to this susceptibility. The experimental data on dispersion, temperature dependences, and the absolute value of nonreciprocal birefringence in Co 3 B 7 O 1 3 I can be adequately described in the considered model.