Low-field linear magnetoresistance and transport parameters of (Cd1-xMnx)3As2 polycrystals

• Published in: European physical journal plus 2022-03, Vol.137 (3), p.374
• Main Authors: Oveshnikov, Leonid N., Ril’, Alexey I., Mekhiya, Alberto B., Davydov, Alexander B., Marenkin, Sergey F., Aronzon, Boris A.
• Format: Article
• Language: English
• Subjects: Applied and Technical Physics; Atomic; Complex Systems; Condensed Matter Physics; Crystal defects; Crystallites; Electron transport; Electrons; Low temperature; Magnetic fields; Magnetoresistance; Magnetoresistivity; Manganese; Mathematical and Computational Physics; Molecular; Optical and Plasma Physics; Phase transitions; Physics; Physics and Astronomy; Polycrystals; Regular Article; Theoretical; Thin films
• ISSN: 2190-5444
• DOI: 10.1140/epjp/s13360-022-02560-7

In this study, we analyzed the composition-dependent phenomena in (Cd 1 - x Mn x ) 3 As 2 polycrystals with x = 0 – 0.08. We showed that the Mn-induced stabilization of minor α ′ ′ -phase in these systems occurs without substantial decrease in the characteristic crystallite sizes. The comparison of the estimated relevant length scales suggests that polycrystalline character of the studied samples plays only a minor role in electron transport, while the increase in defect density along with Mn content has more profound effect. We observed low-temperature linear magnetoresistance even for the samples with high Mn content. The decrease in the corresponding effect amplitude can be explained in terms of basic properties of the parent Cd 3 As 2 compound. Therefore, we argue that Mn-doping qualitatively conserves characteristic features of the Dirac semimetal phase in the system with relatively high Fermi energies, in accordance with previous band calculations of the (Cd 1 - x Mn x ) 3 As 2 compound.