Magnetic phase diagrams of Ce1−M B2C2 (M=La and Lu)

Abstract We have synthesized the Ce 1− x La x B 2 C 2 and Ce 1− x Lu x B 2 C 2 samples and measured the temperature dependence of low-field magnetization, AC-susceptibility and specific heat. As the La or Lu concentration x increases, the Neel temperature T N decreases linearly for x ⩽0.20. However, concentration x dependence of the transition temperature changes the slope at x ∼0.25, and spin-glass transitions are observed for x ⩾0.25. The origin of the spin-glass behavior will be discussed.