Nd0.5Gd 0.5Fe 3（BO3）4单晶中Nd3 +离子的电子跃迁和局域性质
Electron transitions and local properties of Nd3+ ion in Nd0.5Gd0.5Fe3(BO3)4 single crystal
摘要：
测量了Nd_（0.5）Gd_（0.5）Fe_3（BO_3）_4单晶在10000 ~ 21000 cm ~（-1）范围内的偏振吸收光谱和磁圆二色性（MCD）光谱。在2 - 293 K范围内研究了吸收光谱随温度的变化，在2 K时研究了吸收光谱随磁场0 - 65 kOe的变化。Nd ~（3+）离子的4f激发态分别用不可约表示和|J，+-MJ>自由原子的波函数。测定了f-f跃迁时Lande因子的变化以及基态和激发态的交换劈裂。结果发现，电子跃迁的选择规则在晶体的磁有序状态下发生了实质性的变化。它们对于不同的跃迁是不同的，并且它们强烈地依赖于Fe子晶格磁矩相对于光偏振的取向。结果表明，激发态Nd ~（3+）离子附近的局域磁性与其状态密切相关。特别是在某些激发态出现弱铁磁矩，发生场致重取向磁跃迁和局部磁各向异性类型的变化。在某些激发态中发现了非等价的Nd ~（3+）心。
英文摘要：
Polarized absorption spectra and magnetic circular dichroism (MCD) spectra of Nd0.5Gd0.5Fe3(BO3)4 single crystal were measured in the range of 10000 - 21000 cm-1. The absorption spectra were studied as a function of temperature in the range of 2 - 293 K and as a function of magnetic field 0 - 65 kOe at 2 K. The excited 4f states of the Nd3+ ion were identified in terms of the irreducible representations and in terms of |J,+-MJ> wave functions of the free atom. The changes of the Lande factor during f-f transitions and the exchange splitting of the ground and excited states were determined. It was found out that the selection rules for electron transitions substantially changed in the magnetically ordered state of the crystal. They are different for the different transitions and they strongly depend on the orientation of the Fe sublattice magnetic moment relative to the light polarization. It was revealed that the local magnetic properties in the vicinity of the excited Nd3+ ion substantially depended on its state. In particular, in some excited states a weak ferromagnetic moment appears, the field induced reorientation magnetic transitions occur and the changes of the local magnetic anisotropy type take place. In some excited states the nonequivalent Nd3+ centers were found out.
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