Abstract
The results concerning field dependences of magnetization for Co 0.55Cu 0.45Cr 2S 4- y Se y ferrimagnetic spinels studied in a temperature range of 4.2-300 K with the use of both high stationary fields up to 14 T and strong pulsed fields up to 15 T are presented. From the magnetization curves of static and pulsed measurements the incremental high field susceptibility P Xhf has been obtained. The temperature and concentration ( y) dependences of χ hf are interpreted based on the magnetic properties of the spinels under study. The significant lowering of the value of χ hf was observed for y = 0.8, in which the total magnetic moment per molecule at 4.2 K and paramagnetic Curie-Weiss temperature exhibit similar anomalies. In the compounds under study exist superexchange interactions between the nearest cations: ferromagnetic for Cr 3+ -X-Cr 4+ and Co 2+ -X-Co 2+, antiferromagnetic for Co 2+ -X-Cr n+ . A change of χ hf is a result of three following reasons: (i) change of the crystal field-when S is substituted by Se, (ii) intermediate character of the bonds-between ionic and covalent and (iii) varation of the overlap of the orbitals in the antiferromagnetic interaction Co 2+ -X-Cr n+ .
Published Version
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