Magnetic entropy scaling in two-dimensional intrinsically ferromagnetic semiconductor CrI3.

The magnetic entropy changes of ΔS_M(T,H) around the magnetic transition temperature (T_C) have been investigated by the scaling method in a two-dimensional ferromagnetic semiconductor (2D FS) CrI₃ single crystal. The critical parameters based on ΔS_M(T,H) have been obtained. The ΔS_M(T,H) under different magnetic fields can be scaled into a single curve independent of external field and temperature. The magnetic entropy is about 3.21 J/kg K at applied magnetic field H = 4.5 T. The critical parameters n, b, and c obtained from magnetic entropy ΔS_M(T,H) are about 0.62(1), 0.69(2), and 1.30(3), respectively. The value of n is close to that of the 3D Heisenberg model. The temperature dependent n at different magnetic fields scales into one universal line above T_C and deviates the scaling line at low temperatures. The deviation can be attributed to the strong uniaxial anisotropy effect in CrI₃. The result is helpful for understanding the origin of the magnetic phase transition in 2D FSs. [ABSTRACT FROM AUTHOR]