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- W2014862337 abstract "At low temperature the Raman spectrum of KCoF3 is due to 1 and 2 exciton scattering. The XX spectrum shows several lines at 2°K (fig. 1) ; the XY spectrum consists in 1 weak line centered at 350 cm−1. Symmetry and frequency considerations allow assignment of the lines. The energies were calculated using a first neighbour Co‐Co isotropic exchange interaction model : i) The broad line showing a maximum around 415 cm−1, is due to 2 magnon scattering which, as expected, is intense only in XX. A self‐consistent molecular field calculation shows that its energy U only weakly depends upon the spin‐orbit coupling constant X : for Ι = − 150 cm−1, the previously determined value of the magnon frequency at the Brillouin zone boundary (237 cm−1)1 leads to U ≃ 425 cm−1 with J = − 10.6 cm−1 where J is the exchange integral. ii) The high frequency spectrum, the 2 maxima at 405 and 465 cm−1 in XX polarization and the weak line in XY are attributed to well defined 1 exciton peaks : using a molecular field approximation, the best fit to high frequency spectrum is obtained for Ι = − 149 cm−1 and J = − 10.6 cm−1 ; however, the agreement is poor since the mean quadratic deviation is 60 cm−1. Buyers et al2 found practically the same value of Ι from neutron scattering by low energy excitons ; finally, their many level spin wave model provides the correct frequencies for 1 exciton Raman scattering at low energy." @default.
- W2014862337 created "2016-06-24" @default.
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- W2014862337 date "1972-01-01" @default.
- W2014862337 modified "2023-09-23" @default.
- W2014862337 title "ONE AND TWO EXCITON RAMAN SCATTERING IN KCoF3" @default.
- W2014862337 doi "https://doi.org/10.1063/1.3699450" @default.
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