Spin-Wave Dispersion in KFeS<sub>2</sub>–a Linear Chain Antiferromagnet and a Spin Analogue of Two Iron Ferrodoxins–by Neutron Inelastic Scattering

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  • Spin-Wave Dispersion in KFeS<SUB>2</SUB>—a Linear Chain Antiferromagnet and a Spin Analogue of Two Iron Ferrodoxins—by Neutron Inelastic Scattering

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Inelastic neutron scattering has been used to study the magnetic excitation spectrum of KFeS2—a spin analogue of the oxidized two iron ferredoxins–in the antiferromagnetically ordered state. The observed spin wave dispersion relations along a*, b*, c* directions at 77 K are analyzed to give the nearest neighbor intra-chain exchange constant J1=−168.1±4.8 cm−1 (−20.84±0.60 meV), and the ratio of the nearest interchain to the intra-chain interaction |J3|⁄|J1|=8.6×10−3 indicative of the strong covalency and of the one-dimensional character of the interaction. The anisotropy field of 6040±91 Oe obtained from the gap at the zone center results mostly from the non-dipolar energy. A contribution of quartic terms of spins in the anisotropy energy is needed to account for the observed easy spin direction.

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