Figure 2
Magnetic properties of Bi2-xGdxTe3.
(a) Magnetization versus field M(H) measured at 2 K. (b) Magnetic susceptibility versus temperature χ(T) measured at 1 kOe for x = 0.20. Its inverse curve is displayed in the right axis. The arrow represents the antiferromagnetic transition temperature of TN and the red line represents the fitted curve with the Curie-Weiss law. In the inset, the M(H) data for x = 0.08 and 0.20 are replotted with a scale of μB per Gd. (c) Phase diagram with the magnetic transition from paramagnetic (PM) and antiferromagnetic (AFM) phases. In the PM phase, there is an additional regime with ferromagnetic (FM) exchange interaction. The magnetic critical point (MCP) regime is displayed around x = 0.09. The open squares represent the Weiss temperature θP obtained from the Curie-Weiss law and the closed circles represent the antiferromagnetic transition temperature TN obtained from the χ(T) data.
