Comparison of the Absorption Spectra of Nd3+ Ions in the NdFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and Ho0.75Nd0.25Fe3(BO3)4 Crystals

被引：1
|
作者：
Sukhachev, A. L. [1 ]
Malakhovskii, A. V. [1 ]
Nelson, C. S. [2 ]
Gudim, I. A. [1 ]
Temerov, V. L. [1 ]
机构：
[1] RAS, Kirensky Inst Phys, FRC, KSC,SB, Krasnoyarsk 660036, Russia
[2] Brookhaven Natl Lab, Natl Synchrotron Light Source 2, Upton, NY 11973 USA
来源：
PHYSICS OF THE SOLID STATE | 2021年 / 63卷 / 01期
基金：
俄罗斯基础研究基金会;
关键词：
neodymium; hantite-structure ferroborates; f-f electronic transitions; structural transition;
D O I：
10.1134/S1063783421010200
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The polarized optical absorption spectra in the region of a series of the f-f transitions of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)(4), Nd0.5Gd0.5Fe3(BO3)(4), and NdFe3(BO3)(4) crystals at 90 K have been compared. The spectral features related to the difference in the local environment of Nd3+ ions in these crystals have been established. In the region of the transition I-4(9/2) -> (4)G(5/2) + (2)G(7/2) of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)(4) crystal, the appearance of some absorption lines at the structural transition R32 -> P3(1)21 around similar to 200 K due to the local symmetry variation has been found. The intensity of these lines smoothly increases with a decrease in temperature from the transition point. The temperature dependence of the lattice parameters of the Ho0.75Nd0.25Fe3(BO3)(4) crystal has been measured. It has been found that, at the transition temperature, the lattice parameter a changes stepwise, which is indicative of the occurrence of a first-order phase transition. The lattice parameter c changes smoothly.
引用
收藏
页码：113 / 121
页数：9
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