Electron Paramagnetic Resonance of Gd3+ Ions in the Pb1 – x – yGdxCuyS Narrow-Gap Semiconductor: Effects of Resonance Transitions on Conductivity

IF 0.48 Q4 Physics and Astronomy

Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-16 DOI:10.1134/S1062873824708493

V. A. Ulanov, R. R. Zainullin, I. V. Yatsyk, A. V. Shestakov, A. M. Sinitsyn

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Abstract

Crystals of the narrow-band semiconductor Pb_{1 –} _x _– _yGd_xCu_yS (x = 1.1 × 10^–3, y = 2.5 × 10^–3) at temperatures T = 5–300 K demonstrated unusual dependences of the shape of the lines of the electron paramagnetic resonance (EPR) spectra of paramagnetic centers of Gd³⁺ on temperature and microwave power in the resonator of EPR spectrometer. Analysis of the shape parameters of the resonance lines recorded in the X band showed that one of the causes of the unusual changes in the observed EPR spectra of Gd³⁺ centers is a nonuniform distribution of the acceptor impurity of copper with the formation of regions with different concentrations of free charge carriers. Apparently, in these regions, resonance transitions between the spin states of Gd³⁺ centers differently affect the kinetic characteristics of free charge carriers, which lead to different contributions to the quasi-resonant absorption of microwave power.

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Pb1 - x - yGdxCuyS窄隙半导体中Gd3+离子的电子顺磁共振：共振跃迁对电导率的影响

窄带半导体Pb1 - x - yGdxCuyS晶体（x = 1.1 × 10-3, y = 2.5 × 10-3）在温度T = 5-300 K时，显示出Gd3+顺磁中心电子顺磁共振（EPR）谱线的形状与温度和EPR光谱仪谐振腔中的微波功率有不同寻常的依赖关系。对X波段记录的共振谱线形状参数的分析表明，Gd3+中心EPR谱发生异常变化的原因之一是铜的受体杂质分布不均匀，形成了不同浓度的自由载流子区域。显然，在这些区域中，Gd3+中心自旋态之间的共振跃迁对自由载流子的动力学特性有不同的影响，从而导致对微波功率准共振吸收的贡献不同。

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

Bulletin of the Russian Academy of Sciences: Physics Physics and Astronomy-Physics and Astronomy (all)

CiteScore

0.90

自引率

0.00%

发文量

251

期刊介绍： Bulletin of the Russian Academy of Sciences: Physics is an international peer reviewed journal published with the participation of the Russian Academy of Sciences. It presents full-text articles (regular, letters to the editor, reviews) with the most recent results in miscellaneous fields of physics and astronomy: nuclear physics, cosmic rays, condensed matter physics, plasma physics, optics and photonics, nanotechnologies, solar and astrophysics, physical applications in material sciences, life sciences, etc. Bulletin of the Russian Academy of Sciences: Physics focuses on the most relevant multidisciplinary topics in natural sciences, both fundamental and applied. Manuscripts can be submitted in Russian and English languages and are subject to peer review. Accepted articles are usually combined in thematic issues on certain topics according to the journal editorial policy. Authors featured in the journal represent renowned scientific laboratories and institutes from different countries, including large international collaborations. There are globally recognized researchers among the authors: Nobel laureates and recipients of other awards, and members of national academies of sciences and international scientific societies.