Анизотропия парамагнитной восприимчивости дираковского полуметалла Cd-=SUB=-3-=/SUB=-As-=SUB=-2-=/SUB=-, обусловленная примесью хрома: ЭПР на ионах Cr-=SUP=-3+-=/SUP=-

Физика твердого тела Pub Date : 2023-01-01 DOI:10.21883/ftt.2023.03.54733.553

Ю. В. Горюнов, А.Н. Натепров

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Abstract

In the literature devoted to magnetic impurities in Dirac semimetals, the appearance of anisotropic and long-range non-oscillating contributions to the Ruderman–Kittel–Kasuya–Yosida interaction is predicted. These contributions are due to the hybridization of the wave functions of magnetic impurities with the wave functions of Dirac electrons, which have a linear dispersion law. We have studied electron paramagnetic resonance (EPR) in powder samples of topological 3D Dirac semimetal Cd3As2 with an admixture of chromium ions. Anisotropy of the magnetic susceptibility in the paramagnetic state was found from the behavior of the resonance field. The appearance of magnetic anisotropy in the paramagnetic state is associated with an increase in the contribution of the orbital moments of chromium ions Cr2+ and Cr3+ due to their interaction with the orbital moments of donor Dirac electrons, which have anomalously large values of g factors.

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在专门研究狄拉克半金属中的磁性杂质的文献中，预测了各向异性和远程非振荡对Ruderman-Kittel-Kasuya-Yosida相互作用的贡献。这些贡献是由于磁性杂质的波函数与狄拉克电子的波函数的杂化，它们具有线性色散定律。本文研究了掺杂铬离子的拓扑三维狄拉克半金属Cd3As2粉末样品的电子顺磁共振(EPR)。从共振场的特性出发，发现了顺磁状态下磁化率的各向异性。顺磁状态下磁各向异性的出现与铬离子Cr2+和Cr3+的轨道矩贡献的增加有关，这是由于它们与供体狄拉克电子的轨道矩相互作用，它们具有异常大的g因子值。

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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Физика твердого тела

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