Specific Heat and Magnetic Properties of Single-Crystalline (Zn_0.925In_0.054)[Cr_1.84In_0.152]Se₄Semiconductor

Abstract

An antiferromagnetic order with a Néel temperature TN = 17.5 K, a strong ferromagnetic exchange evidenced by a positive CurieWeiss temperature θCW = 77.3 K, the fuzzy peaks in the real component of susceptibility χ ′ (T ) and the disappearance of the second critical eld were established. The curvature of specic heat C(T ) and C(T )/T in surrounding of TN 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 R ln(2S + 1) = 11.52 J/(mol K) calculated for the spin 3/2.