Mn^<2+> Internal Emission Excitonic Emission of MBE-Grown Cd_<1-x>Mn_xTe : Dependence on Substrate Temperature and Magnetic Field

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It has been reported that there exists Mn-related photoluminescence at 2.0 eV in addition to excitonic emission in Cd, ..Mn...Te with x more than 0.3 grown by conven-tional methods. We have investigated dependence of these luminescence lines onsubstrate temperature, T, in MBE-grown Cd.,.,Mn..Te crystals. A large broad linewas observed at around 2.05 eV in sanmples grown at high T, at about 400'C whereas asharp line at around 2.17 eV evolved in samples grown at T.= 320-340'C. Both ofthese lines were seen in the case of 7',=38O'C. Measurement of the magnetic fielddependence of the peak positions up to 40 T revealed that the former ttssigned as Mnrelated luminescence shows no observable Zeeman shift. On the other hand, the lateris assigned as the excitonic emission because of the large shift to lower energy in themagnetic field. The experimental results suggest that the Mn-related photolumines-cence at 2.0 eV us affected strongly by crystal imperfections, probably the vacancytype defects. On the basis of these results, a possible optical processes of the Mn-related luminescence are discussed.
社団法人日本物理学会の論文
1992-01-15