【摘要】 本文报道4.2—300K和20—350cm^-1范围内低组份Cd_1-xZn_xTe混晶远红外吸收与反射光谱。实验观察到Zn及ZnTe在CdTe中诱发的定域模和准定域模以及类CdTe2TA双声子吸收过程。用质量缺陷模型结合格林函数方法估计了模式频率。用等位移模型计算了混晶的双模行为并拟合反射光谱,对类CdTe和类ZnTe模的弛豫与声子吸收强度的温度效应也作了计算和解释。更多还原

【Abstract】 We report here the far infrared absorption and reflection spectra of the mixed crystals ZnxCd_1-xTe with small x in the temperature range of 4.2-300 K and the frequency region of 20-350 cm^-1. The local and quasi-local modes induced by Zn and ZnTe in CdTe and the CdTe-like 2TA two-phonon absorption are observed. The frequencies of the modes are estimated by useing the mass-defect model combined with Green’s function method. The random element isodisplacement （REI） model is used to calculated the two mode behaviors of the mixed crystals and to best fit the reflection spectra. Besides, the temperature dependence of the phonon absorption and the relaxation factor of CdTe-like and ZnTe-like modes are calculated and explained.更多还原