Anisotropy of the Paramagnetic Susceptibility in the 3D Dirac Semimetal Cd-=SUB=-3-=/SUB=-As-=SUB=-2-=/SUB=- Caused by Chromium Impurity: the EPR on Cr-=SUP=-3+-=/SUP=- Ions

IF 0.9 4区物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Physics of the Solid State Pub Date : 2023-01-01 DOI:10.21883/pss.2023.03.55575.553

Goryunov Yu. V., Nateprov A. N.

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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. Keywords: magnetic resonance, topological materials, magnetic impurities.

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铬杂质引起的三维Dirac半金属Cd-=SUB=-3-=/SUB=- as -=SUB=-2-=/SUB=-的顺磁化率各向异性:Cr-=SUP=-3+-=/SUP=-离子的EPR

在专门研究狄拉克半金属中的磁性杂质的文献中，预测了Ruderman—Kittel—Kasuya—Yosida相互作用的各向异性和远程非振荡贡献的出现。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。关键词:磁共振，拓扑材料，磁性杂质。

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来源期刊

Physics of the Solid State 物理-物理：凝聚态物理

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

2-4 weeks

期刊介绍： Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.