Magnetic critical behavior of an above room temperature skyrmion material Co_8.68Zn_8.65Mn_2.67

Theβ-Mn type Co_xZn_yMn_20-x-ycompound, known for hosting magnetic skyrmions beyond room temperature, plays a key role in understanding complex magnetic behaviors and advancing spintronics, particularly in skyrmion-based magnetic data storage and processing. In this study, we thoroughly investigated the field-dependent critical behavior of the cubicβ-Mn type Co_8.68Zn_8.65Mn_2.67single-crystal, focusing on magnetic isotherms near its Curie temperature. Employing methods such as modified Arrott plots, the Kouvel-Fisher method, and critical isothermal analysis, we determined the critical exponentsβ, γ, andδ, which are 0.456 ± 0.001, 1.144 ± 0.016, and 3.510 ± 0.040 respectively. According to renormalization group theory, the magnetic interaction in this system decays with distancerasJ(r)≈r-4.7. These values indicate that the Co_8.68Zn_8.65Mn_2.67system's critical behavior is intermediate between the mean-field model and the 3D Heisenberg model. Specifically, this decay pattern indicates that as temperature increases, the critical behavior of Co_8.68Zn_8.65Mn_2.67may approach the mean-field model, while at low temperatures, spin fluctuations and stronger local interactions may cause its behavior to resemble that of the Heisenberg model.