Weak antilocalization in thin films of the Bi2Te2.7Se0.3 solid solution

Абдуллаев, Н. А.; Alekperov, O. Z.; Алигулиева, Х.В.; Zverev, V. N.; Kerimova, A. M.; Mamedov, Nazim

doi:10.1134/s106378341609002x

Cited by 2 publications

(1 citation statement)

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“…Ions Cr 3+ , on which EPR is observed, may have a stabilized valence, or may participate in a double exchange [10], the carriers of which in this case are donor Dirac electrons, the state of motion which are topologically protected. In this case, the lifetime of the Cr 3+ and Cr 2+ ions, or the exchange frequency, will affect the EPR linewidth and the phase of the Dirac electron wave function, which determines the modes of weak localization or antilocalizations [20][21][22][23]. This circumstance indicates the opportunity that the conditions for the implementation of the weak antilocalization regime will depend on the direction of motion of the Dirac electrons and, depending on the direction of the current, a positive [24] or a negative [25] magnetoresistance.…”

Section: Electron Paramagnetic Resonancementioning

confidence: 99%

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

Goryunov Yu. V.,

Nateprov A. N.

2023

Physics of the Solid State

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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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