Multiple Magnetic Phase Transitions and Critical Behavior in Single Crystal Cr5Te6

In this work, the chemical vapor transport method was used to grow ferromagnetic Cr5Te6 single crystal. Novel multiple magnetic phase transitions have been discovered by magnetization measurements. The critical behavior from ferromagnetism to paramagnetism transition has been investigated in detail. The magnetic entropy changes are estimated by the Maxwell relation. The critical parameters of β = 0.405, γ = 1.200, δ = 3.96 as well as the Curie point TC ≈ 338 K are determined by various theoretical models. The calculated critical parameters are not only intrinsic and self-consistent, but also obey the scaling equation around TC. Further analysis using renormalization theory reveals that the spin interaction for Cr5Te6 is long-range type, and its magnetic interaction cannot be classified into an universal class, the spin exchange interaction distance decays as J(r) ≈ r−4.79.