Structural and magnetic properties of CdxInyCrzSe4

Mixed selenide spinels of (Cd)[Cr1.81In0.19]Se4 and (Cd0.745In0.255)[Cr1.94In0.06]Se4 have been studied using X-ray diffraction, magnetic measurements and ESR spectroscopy. In3+ ions accommodate both tetrahedral and octahedral sites in the spinel structure. The magnetic short-range order appears in the critical region from Tc to about 200 K for the selenide spinels. The linear temperature dependence of the resonance linewidth at T>250 K is interpreted by an occurrence of one-phonon process in a spin-lattice relaxation.