Features of the Behavior of Mn2+ Ions in the 3D Dirac Semimetal α-Cd3As2 from EPR Data

The behavior of manganese impurity in three-dimensional Dirac semimetal Cd3As2 has been studied using the electron paramagnetic resonance (EPR) method and electromagnetic measurements. It is found that, in contrast to doping with europium, doping with manganese (as well as iron) does not change the sign of magnetoresistance, which is almost completely suppressed at high manganese concentrations. At the same time, the character of the magnetic-field influence on the contact potential changes. The values of g factors measured using EPR coincide with those of a free electron at all temperatures, which indicates (taking into account the fluctuation behavior of the EPR linewidth and reduced magnetic moment at Mn2+) the formation of short-lived bound states of the Mn2+ ion and conduction electrons-antiferromagnetic polarons.