Abstract
The crystal structure of spinel FeCr2S4, which shows a semiconductor-metal transition and paramagnetic-ferrimagnetic transition at Tc = 170 K, was determined by x-ray powder diffraction. It is found that the spinel FeCr2S4 belongs to a normal spinel structure [Fe2+]t[Cr23+]oS4. The result clearly shows that the spinel FeCr2S4 has neither mixed valence of Fe3+ and Fe2+ ions or Cr3+ and Cr2+ ions for a double-exchange magnetic interaction, nor a Jahn-Teller cation such as Cr3+. The spinels represent a distinct class of colossal magnetoresistance materials, with magnetic ordering driven by superexchange rather than double exchange.
Published Version
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