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- W2053756983 abstract "Spin-dependent (SD) phonon Raman scattering in ferromagnetic CdCr2X4 is closely associated with the resonance effect. In order to clarify the correlation between the excitation energy dependence of the SD phenomenon and the electronic structure, detailed temperature dependences of absorption and Faraday rotation spectra were measured between 20 and 300 K for ’’red-shifting (RS)’’ transitions in CdCr2S4 ∼1.9 eV) and CdCr2Se4 (∼1.2 eV). We found that the RS absorption peaks consists of a pair of electronic transitions with the energy separation of about 0.07 eV at 20 K. It turned out that the SD scattering cross section for Raman active phonon modes T2g and A1g in CdCr2S4 observed with red excitation light are caused by the resonance with the pair transitions. Magnetic circular polarization properties of Raman spectra for CdCr2S4 were measured in the applied fields up to 45 kOe in the Faraday configuration. The polarization and field-induced effects observed with Kr 647.1 nm excitation light support the idea of SD resonance scattering. SD effects for phonon modes T2g and A1g are also found with higher excitation energies C1 (2.4 eV; CdCr2S4, 2.0 eV;CdCr2Se4) and C2 (2.3 eV;CdCr2Se4), respectively. The correlations between the SD phonon scattering and the electronic structures are discussed on the basis of proposed transition diagrams." @default.
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- W2053756983 date "1978-03-01" @default.
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- W2053756983 title "Spin-dependent phonon Raman scattering and electronic structure of CdCr2<i>X</i>4 (<i>X</i>:S,Se)" @default.
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