Abstract
The thiospinels of composition FeCr2S4 and Fe1+xCr2−2xSnxS4 with 0<x<0.1 have been examined by means of extended x-ray absorption fine structure,Mössbauer spectroscopy and magnetoresistance techniques. The structuralcharacterization shows that tin enters the spinel-related lattice asSn4+ and occupies the octahedral B site. Appreciable magnetoresistanceis observed in the temperature range 160–185 K which includes themagnetic ordering temperature. The effect of slight non-stoichiometry inFeCr2S4 and of tin doping is observed in the Mössbauer spectra which show theFe2+ ions to occupy the tetrahedral A sites. The Mössbauer spectra recorded around the magneticordering temperature are sensitive to small (0.03 T) applied magnetic fields. The influenceof tin on the low temperature magnetic behaviour is associated with the distribution ofCr3+,Sn4+ andFe3+ ions aroundtetrahedral Fe2+ sites and vacancies in the anionic sublattice. An interpretation of the colossal magnetoresistance phenomenabelow TN is suggested.
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