Theory of Spin-Dependent Phonon Raman Scattering in Magnetic Crystals. II : Application to Europium Sulphide

概要

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A general theory of Raman scattering in a magnetic crystal due to excitation of one phonon and simultaneous excitation of the spin system is developed. Within the molecular field approximation in the case of a ferromagnet it is predicted that the Raman intensity increases with increasing temperature and attains a constant value at temperatures higher than T_c and that the Raman line has a broad linewidth that corresponds to the whole phonon frequency range in the Brillouin zone. The theory is applied to the "broad Raman line" observed in EuS. The observed temperature dependence of the Raman intensity is qualitatively explained and the calculated Raman line shape with phonon frequencies obtained on the basis of the shell model agrees well with the observed one.
社団法人日本物理学会の論文
1976-05-15