Spin-dependent phonon Raman scattering in CdCr2Se4 |
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Authors: | N Koshizuka Y Yokoyama T Tsushima |
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Institution: | Electrotechnical Laboratory, Tanashi, Tokyo 188, Japan |
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Abstract: | Influences of ferromagnetic ordering on the phonon Raman scattering are studied for CdCr2Se4 through the intensity measurements of Raman spectra between 25 and 300 K with various wavelengths of excitation light (488.0–676.4 nm). Spin-dependent enhancements of Raman cross section are observed for optical phonon lines D(168 cm?1) and F(238 cm?1) with excitation wavelengths of about 630 and 550 nm, respectively. This kind of phenomenon in spinel-type chalcogen chromites seems to originate in spin-dependent intermediate interactions in the excited states of specific electronic transitions with which the incident or scattered light is resonant. |
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