Abstract
Semiconducting spinel CdCr 2Se 4 orders ferromagnetically below T C=130 K. A series of single-crystals of CdCr 2Se 4 doped with Sb 3+ ions has been synthesized in order to study an effect of the substitution on the cation distribution and the magnetic properties. The compounds of Cd y Sb x Cr z Se 4 have been investigated by means of X-ray diffraction, magnetization measurements and electron spin resonance spectroscopy. Two selected samples of the composition (Cd 1− x Sb x )[Cr 2]Se 4 with x=0.13 and 0.44 retained cubic symmetry with space group Fd 3 ¯ m . The unit cell parameter appeared to be sensitive to the concentration of Sb 3+ admixture: it increases with x, despite a close similarity in the ionic radii of Cd 2+ and Sb 3+ in tetrahedral coordination. Upon partial substitution of Cd 2+ by Sb 3 no obvious change in the Curie temperature was observed, however, the effective magnetic moment slightly increased, what may result from the appearance of Cr 2+ ions. The characteristic feature of the system studied is an extended range of short-range magnetic order, in which the magnetic properties in the paramagnetic state are governed by the formation of ferromagnetic clusters, as indicated by both the bulk magnetometric and spectroscopic data.
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