Specific Heat and Magnetic Properties of Single-Crystalline $(Zn_{0.925}In_{0.054})[Cr_{1.84}In_{0.152}]Se_4$ Semiconductor

An antiferromagnetic order with a Néel temperature $T_{N}$ = 17.5 K, a strong ferromagnetic exchange evidenced by a positive Curie-Weiss temperature $\Theta_{CW}$ = 77.3 K, the fuzzy peaks in the real component of susceptibility χ'(T) and the disappearance of the second critical field were established. The curvature of specific heat C(T) and C(T)/T in surrounding of $T_{N}$ indicated a broad peak, characteristic for the system with inhomogeneous magnetic state (spin-glass-like phase). The calculated magnetic entropy showed the value of S(T) ≈ 1 J/(mol K) which is extremely small; i.e., much lower than the magnetic contribution Rln(2S + 1) = 11.52 J/(mol K) calculated for the spin 3/2.