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Features of temperature behavior of ESR spectra of Cr3+ ions in 3D Dirac semimetal Cd3As2
Goryunov Yu. V. 1, Nateprov A. N.2
1Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Kazan, Russia
2Institute of Applied Physic of Chisinau State University, Chisinau, MD-2028, Moldova
Email: gorjunov@kfti.knc.ru, alexandr.nateprov@ifa.md

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The temperature behavior of chromium impurity in the Dirac semimetal α-Cd3As2 was studied using the electron spin resonance (ESR) method on the Cr3+ ion. Small intensity of the ESR spectra on the Cr3+ ions definitely points that the main valence state of chromium, as well as other impurities, in this material is the Cr2+ state. Some of these ions turn into the valence state of Cr3+. Cr3+ ions located in tetrahedral vacancies turn into the anti-ferromagnetic phase at the temperatures above 127 K. The transition is accompanied by a sharp narrowing of the ESR spectrum and a collapse of its hyperfine structure. At the temperatures below 50 K, the remaining magnetic ions located in the positions of cadmium ions turn into the ferromagnetic phase, the appearance of which is indicated by a sharp broadening of the exchange-narrowed resonance line and its strong shift to low resonance fields. The observed inversion of the shape of the exchange-narrowed line of the hyperfine structure of the spectrum requires more detailed study. Keywords: magnetic resonance, topologic materials, magnetic impurities.
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