Transformation of f-f absorption bands of holmium ions in Ho0.75Nd0.25Fe3(BO3)4 crystal during spin-reorientation transition

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-05-12 DOI:10.1016/j.optmat.2025.117150

A.V. Malakhovskii, A.L. Sukhachev, V.V. Sokolov, I.A. Gudim

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引用次数: 0

Abstract

Polarized absorption spectra of the Ho_0.75Nd_0.25Fe₃(BO₃)₄ crystal in the region of ⁵I₈→⁵F₅, ⁵S₂ + ⁵F₄, ⁵F₃ and ⁵F₂ absorption bands of Ho ions were studied as a function of temperature in the range of 5–20 K. The absorption spectra were decomposed into Lorentzian or Gaussian components. Below 203 K, the local symmetry of the holmium ion is C₂. However, an analysis of the polarization of the absorption lines from the point of view of the selection rules showed that in the easy-axis state of the crystal (T < T_R = 6.9 K), the local symmetry of the holmium ion is close to D₃. At T > T_R, a distortion of the local symmetry appears, which increases with increasing temperature. Shifts in the positions of absorption lines are observed at the spin-reorientation transition. The shifts are different for different lines. This means that the local magnetic anisotropy of the holmium ion, the Ho–Fe exchange energy, and the local crystal field are different in different excited states of holmium. Significant and different changes in the intensity of absorption lines depending on temperature were observed both during the reorientation transition and above it, which is a consequence of changes of the local crystal field in excited states with temperature.

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Ho0.75Nd0.25Fe3(BO3)4晶体自旋重取向转变过程中钬离子f-f吸收带的转变

研究了Ho0.75Nd0.25Fe3(BO3)4晶体在5I8→5F5、5S2 + 5F4、5F3和5F2 Ho离子吸收带的极化吸收光谱随温度在5 ~ 20 K范围内的变化规律。吸收光谱分解为洛伦兹和高斯分量。在203k以下，钬离子的局部对称性为C2。然而，从选择规律的角度对吸收谱线的偏振分析表明，在晶体易轴态下(T <；TR = 6.9 K)时，钬离子的局部对称性接近于D3。在T >；随着温度的升高，局部对称性出现畸变。在自旋重取向跃迁中观察到吸收谱线位置的变化。对于不同的线路，位移是不同的。这意味着在不同的激发态下，钬离子的局域磁各向异性、Ho-Fe交换能和局域晶体场是不同的。在重取向转变期间和重取向转变之后，吸收谱线的强度随温度发生了显著的不同变化，这是激发态局部晶体场随温度变化的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.