Magnetic and transport properties of chiral magnet Co₇Zn₈Mn₅

Recently, β-Mn-type Co-Zn-Mn alloys have gained particular attentions as a new class of chiral magnets hosting skyrmion phase. Here, we report the magnetization, magnetoelastic characterization, and transport properties of the chiral magnet Co₇Zn₈Mn₅. The results establish the general features related to the formation of skyrmions, which are found in a small temperature window just below the magnetic Curie temperature T_c. The longitudinal resistivity increases with decreasing temperature at low temperatures due to the enhancement of electron scattering, where the spin-glass state appears. And the resistivity is not affected nearly by the applied magnetic field. In addition, we present the experimental observation of a large anomalous Hall effect (AHE). The anomalous Hall signal abnormally increases at temperatures away from T_c. Quantitative analyses of the measured data suggest that the AHE is dominated by skew-scattering mechanism.