含Co半磁半导体中铁杂质的红外吸收光谱

Infrared Absorption Spectra of Fe-Doped Co Based Semimagnetic Semiconductors

本文首次报道半磁半导体Zn_(0.97)Co_(0.03)S和Zn_(0.95)Co_(0.05)Se中铁杂质的红外吸收光谱.对Zn_(0.97)Co_(0.03)S:Fe,实验发现了 ZnS中 Fe^(2+d)电子跃迁谱中未观察到的位于 2999.8cm^(-1)的新话线;对Zn_(0.95)Co_(0.05)Se:Fe,实验发现了ZnSe中Fe^(2+d)电子跃迁谱中未观察到的位于2778cm^(-1)的新话线.变温与磁光研究以及理论分析表明,新的吸收谱线起源于Fe^(2+)-Co^(2+)对Fe^(2+d)电子的A_1(~5E)、T_1(~5E)→T_2(~5T_2)跃迁.与d-d电子互作用相比,Co^(2+)引起的晶格畸变对Fe^(2+)跃迁的影响可忽略不计.

Infrared absorption spectra of Fe impurity in Semimagnetic semiconductors Zn_(0.97)Co_(0.03)S,Zn_(0.95)Co_(0.05)Se are reported for the first time. New absorption line at 2999.8cm^(-1) of Zn_(0.97)Co_(0.03)S:Fe which never observed in absorption spectrum of ZnS: Fe, and new line at2778.0cm^(-1) of Zn_(0.95) Co_(0.05)Se:Fe which never observed in absorption spectrum of ZnSe:Fe were observed and ascribed to inner d-electron excitation absorption lines of Fe^(2+) inFe^(2+)-Co^(2+) pair, Experiments at various temperatures under magnetic field, and theoreticaldiscussion have approved this ascription. Compared with d-d interaction, lattice distortion ofFe^(2+) induced by Co^(2+) has negligible affect on d-electron states of Fe^(2+) ion.