Magnetic Phase Diagram of Fex(Cu0.5In0.5)1 –xCr2S4 Solid Solutions

We have synthesized Fex(Cu0.5In0.5)1 – xCr2S4 solid solutions and measured their magnetization and dynamic magnetic susceptibility as functions of temperature between room temperature and liquid helium temperature in weak magnetic fields H = 100 Oe and Н~ = 1 Oe at frequencies of 10, 100, 1000, and 10 000 Hz. The results have been used to construct the magnetic phase diagram of the FeCr2S4–(Cu0.5In0.5)Cr2S4 system. The largest area in the phase diagram is occupied by the FeCr2S4 ferrimagnet field (x = 0.28–1), in which there are two types of reentrant spin glass: RSG1 and RSG2. The phase field second in area in the phase diagram is that of spin glass, SG1 (x ≈ 0.03–0.28). Antiferromagnet-based compositions have the smallest area in the phase diagram (x = 0–0.2).