Abstract
Inelastic scattering of light by paramagnetic spin-waves in metals in a constant magnetic field is analyzed. A method to calculate the scattering cross section using the generalized self-consistent field method is introduced. The advantages and limitations of light scattering experiment with respect to EPR techniques in the study of these excitations are pointed out. Frequency shifts, polarization selection rules and line shapes of the Raman spectra for arbitrary orientation of the magnetic field are discussed. '4i ·a constant magnetic field as a result of local fluctuations of the magnetization. Such fluctuations, spin waves in non-magnetic metals, were detected experimental ly for the first time by Schultz and Dunifer using EPR techniques. 1 ) In this note we discuss the feasibility of studying paramagnetic spin waves by means of light scattering, and its advantages and limitations with respect to magnetic resonance experiments. As in the case of light scattering by spin waves in magnetically ordered materials 2 ) the interaction between the radiation field and the magnetization can result from: 1) a direct magnetic dipole coupling of the light with the spin wave magnetization, or 2) an indirect electric-dipole coupling via the spin-orbit interaction. Using a similar method to that devised by Bass and Kaganov, 2 ) for the study of light scattering in ferromagnetic dielectrics, and the results for spin suscep tibility as given in the literature, 3 ),;L), 5 ) it is possible to evaluate the intensity of the scattered light which results from the direct magnetic-dipole coupling. This calculation is briefly described in the Appendix. For Na and K this intensity is several orders of magnitude smaller than the intensitY: of the scattered light from processes involving the indirect electric-dipole coupling, discussed in this article. The latter mechanism was considered by Genkin and Genkin 6 ) to esti mate the absolute Raman cross section due to spin wave scattering in K. They suggest, on the basis of t~eir results for the integrated intensity of the scattered
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