Abstract
Effects of interatomic separation on superexchange interactions, interatomic binding, and spin-rotation transition in Fe7Se8—xSx have been studied by Mossbauer spectroscopy and X-ray diffraction. The crystal structure is found to be “3c” hexagonal superstructure of the NiAs structure, and lattice constants A and C decrease linearly with increasing sulphur concentration. As interatomic distance decreases, Debye temperature, Ne�el temperature, and magnetic hyperfine field increase monotonically. When the number of sulfur ions replacing selenium ions increases from 1 to 7, the interatomic distance decreases by 4.4%, and Debye temperature, Neel temperature, and magnetic hyperfine field at 15 K increase by 12%, 10%, and 6%, respectively. While the spin rotation near 130 K persists for Fe7Se7S, it disappears in Fe7Se8—xSx (x ≥ 2). The iron ions at all three sites are found to be in a highly covalent ferrous state.
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