The Magnetic Properties and Magnetoresistance in the Topological Chiral Magnets Cr_1/3-xNi_xTaS₂

In this study, Cr_1/3-xNi_xTaS₂ single crystals with varying Cr/Ni ratios (x = 0, 1/9, 1/6, and 2/9) were synthesized and characterized to explore their structural, magnetic, and transport properties. The Cr_1/3-xNi_xTaS₂ crystals exhibit a chiral lattice structure, with Cr and Ni ions occupying the same sites. Magnetic susceptibility measurements show an increase in the transition temperature (T_c) as the Ni doping concentration decreases, while above T_c there is a shift from the chiral helimagnetic (CHM) state to a forced ferromagnetic (FFM) state. Magnetoresistance measurements shows that the Cr_1/3-xNi_xTaS₂ single crystals exhibit a double-dome feature at base temperatures, which is attributed to chiral soliton jumps. Magnetic phase diagrams constructed from magnetization and magnetoresistance data further illustrate the dependence of magnetic properties on temperature, magnetic field, and Cr/Ni ratio. Our results highlight the tunability of magnetic states in Cr_1/3-xNi_xTaS₂ crystals and provide new insights into the behavior of chiral magnetic systems and their associated transport properties.