Cation electron states and magnetic structure of the CuCr2-xSbxS4 system

Gamma resonance spectroscopy and nuclear magnetic resonance were used in a study of the cation electron states and of the magnetic structure of CuCr 2−x Sb x S 4 (x = 0-0.5) chalcogenide spinels doped with the Fe isotope. Heterovalent substitution by Sb 5+ ions altered the electron states of the chromium ions and also of the iron impurity ions introduced into the crystal lattice. A redistribution of the Cr 3+ and Cr 4+ ions was accompanied by an increase in the spin density at the 53 Cr nuclei. Introduction of Sb ions into the spinel structure gave rise to superparamagnetic clusters of different dimensions, having different relaxation times. The characteristic features of the magnetic structure were explained by the influence of substitution by Sb ions on the indirect interaction between Cr ions mediated by charge carriers and on Fe−S−Cr intersublattice exchange interaction