Nd0.5Gd 0.5Fe 3（BO3）4中4 I 9/2-（4G 5/2+ 2G 7/2）跃迁行为的特殊性及晶体激发态的局域磁性
Peculiarities of the 4I9/2-(4G5/2+2G7/2) transition behavior in Nd0.5Gd0.5Fe3(BO3)4 and local magnetic properties of the crystal in the excited states
摘要：
本文研究了Nd_（0.5）Gd_（0.5）Fe_（3）（BO_3）_4单晶在Nd ~（3+）离子4 I_（9/2）-（4G_（5/2）+2G_（7/2））跃迁区的偏振吸收光谱随温度（2-34 K）和磁场（0-65 kOe）的变化。在5-40 K范围内测量了天然圆二色光谱。结果表明，激发态离子附近的局域磁性质与其状态密切相关。特别地，在某些激发态中出现了弱的铁磁矩。发现磁有序态的电子跃迁选择规则与顺磁态的电子跃迁选择规则有很大的不同。它们对于不同的跃迁是不同的，并且它们对亚晶格磁矩相对于光偏振的取向非常敏感。在自然圆二色性的光谱中，揭示了在吸收光谱中未观察到的跃迁。
英文摘要：
Polarized absorption spectra of single-crystal Nd0.5Gd0.5Fe3(BO3)4 were studied in the region of transition 4I9/2-(4G5/2+2G7/2) in Nd3+ ion as a function of temperature (2-34 K) and magnetic field (0-65 kOe). Spectra of natural circular dichroism were measured in the range of 5-40 K. It was found out that the local magnetic properties in vicinity of the excited ion substantially depend on its state. In particular, a weak ferromagnetic moment appears in some excited states. It was found out that selection rules for electron transitions in magnetically ordered state substantially deviate from those in paramagnetic state of the crystal. They are different for different transitions and they are very sensitive to orientation of the sublattice magnetic moment relative to the light polarization. In the spectrum of the natural circular dichroism, the transition is revealed which is not observed in the absorption spectrum.
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