Anomalous cyclotron mass dependence on the magnetic field and Berry's phase in (Cd 1-x-y Zn x Mn y ) 3 As 2 solid solutions.

Shubnikov-de Haas (SdH) effect and magnetoresistance measurements of single crystals of diluted II-V magnetic semiconductors (Cd1-x-y Zn x Mn y )3 As2 (x  +  y  =  0.4, y  =  0.04 and 0.08) are investigated in the temperature range T  =  4.2 ÷ 300 K and in transverse magnetic field B  =  0 ÷ 25 T. The values of the cyclotron mass m c , the effective g-factor g*, and the Dingle temperature T D are defined. In one of the samples (y  =  0.04) a strong dependence of the cyclotron mass on the magnetic field m c (B)  =  m c (0)  +  αB is observed. The value of a phase shift close to β  =  0.5 indicates the presence of Berry phase and 3D Dirac fermions in a single crystals of (Cd1-x-y Zn x Mn y )3 As2 in one of the samples (y  =  0.08).