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- 저자 : Debeska, U. (검색결과 1 건)
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Elecrtinic Raman scattering in Cd_1-x C0_xSe
Bartholomew, D. U.,Suh, E. K.,Remdas, A. K.,Rodriguez, S.,Debeska, U.,Furdyna, J. K. 全北大學校 基礎科學硏究所 1991 基礎科學 Vol.14 No.1
The Raman spectrum of the diluted magnetic semiconductor Cd_(1-x)Co_xSe(x=0.035 and 0.082) exhibits a line(W_PM) associated with the transition between the Zeeman-split orbital Γ_2 ground-state levels of Co^2+ and is characterized by g=2.32. Below 20 K, this Raman peak shifts to higher frequencies, signaling the onset of magnetic ordering. At low temperatures, spin-flip Raman scattering from electrons bound to shallow donors(W_SF) is observed. The Raman shift as a function of magnetic field and temperature shows a large s-d exchange interaction(αN_O=320meV) and clear evidence of a bound magnetic polaron. Evidence of magnetic ordering at low temperatures, indicated by the temperature dependence of W_PM, and the large antiferromagnetic temperature(T_AF)required to fit the temperature and magnetic-field dependence of W_SF, indicate a significantly larger Co^2+-Co^2+ antiferromagnetic coupling than is the case for Mn^2+-Mn^2+ in, for example, Cd_(1-x)Mn_xSe.
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