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- W2012303295 abstract "The one-magnon Raman spectrum of FeF2 has been measured as a function of temperature and exciting wavelength. From the acoustic-magnon integrated intensities the authors deduced the ratio r of the quadratic-to-linear magneto-optic coupling coefficients: r was found to increase with wavelength from 0.40+or-0.02 at 457.9 nm to 0.58+or-0.03 at 647.1 nm. The origin of this dependence is unclear. Previous observations of an asymmetry in the acoustic-magnon lineshape have been extended to include measurements at higher temperatures. The asymmetry was found to be independent of the exciting light wavelength and scattering geometry, and increased markedly for temperatures near TN=78K. A theoretical model based on a frequency-dependent damping mechanism satisfactorily accounts for the observed lineshape for T<or approximately=0.8 TN. An alternative mechanism, based on light scattering from magnons at surfaces, was concluded to be unimportant for FeF2 at these wavelengths. Theory and experiment for the temperature dependence of the acoustic-magnon peak frequency were found to be in remarkably good agreement. The theory predicts the behaviour of the three optic modes, as well as the acoustic mode. Two of these modes, near 49 and 59 cm-1 at 63K, have been observed for the first time and their temperature dependences and intensities were found to be in accordance with theory." @default.
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- W2012303295 date "1984-11-30" @default.
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- W2012303295 title "Raman scattering from one-magnon excitations in FeF<sub>2</sub>" @default.
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- W2012303295 doi "https://doi.org/10.1088/0022-3719/17/33/012" @default.
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