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- W1480996486 abstract "Dispersion curves for magnons and phonons propagating in KCoF3 at low temperatures have been determined by means of neutron inelastic scattering techniques. Two branches of magnetic excitations have been observed corresponding to a transition between the two members of the ground state doublet (j=1/2) of the Co2+ ion and a transition between the ground state and the lowest member of the j=3/2 spin-orbit level. Neither branch shows evidence for the directional anisotropy which has been suggested for the exchange interactions in KCoF3; any splitting of the doubly degenerate magnon branch is shown to be less than 8% in frequency. The magnon branch of lowest frequency interacts with a phonon branch in the vicinity of the magnetic zone centre. The strength of the magnon-phonon interaction is found to be 0.35+or-0.10 THz and from the temperature dependence of the modes the magnon-phonon interaction is shown to be appreciable only within a radius 0.2*2 pi /a of the magnetic zone centre. The magnetic modes of higher frequency show a market decrease in intensity with increasing temperature but little change in frequency in accordance with expectations for a transition that depends strongly on the spin-orbit coupling but only weakly on the exchange." @default.
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- W1480996486 date "1971-10-07" @default.
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- W1480996486 title "Excitations in KCoF<sub>3</sub>-I. Experimental" @default.
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