Abstract
The crystallographic and magnetic structures of Fe 0.5 Cu 0.5 Cr 2 S 4 have been examined in order to generate a possible mechanism to explain the CMR behaviour of such spinels. Neutron powder diffraction has revealed that the tetrahedrally coordinated Fe 3+ and Cu + ions are fully ordered, with the magnetic moments of Fe 3+ (µ 300 =–1.97(5) µ B ) aligned antiparallel to those of the octahedrally coordinated Cr 3+ (µ 300 =1.49(3) µ B ). The results suggest a new CMR mechanism, which involves exchange on three cation centres (‘triple exchange’) and requires antiferromagnetic coupling of magnetic spins, in contrast to the manganite perovskites for which double-exchange provides a ferromagnetic state.
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