中文摘要：

采用垂直Bridgman法制备出了x=0.2的Cd1-xMnxTe晶体（Cd0.8Mn0.2Te）。利用MPMS-7（magnetic property measurement system）型超导量子磁强计测量了Cd0.8Mn0.2Te晶体的磁化强度（M）与磁场强度（H）和温度（T）的关系,磁场强度范围为-1592～1592kA/m,温度范围为2～200K。Cd0.8Mn0.2Te晶体的法拉第效应测试在300K温度下进行,磁场强度〈0.2T。2K温度下的M-H曲线表明,晶体的Mn2＋离子之间存在反铁磁相互作用。796A/m恒磁场下的磁化率χ与温度T的关系研究表明,晶体在2～200K之间是顺磁态,当T〉40K时,χ与T满足居里-外斯定律;T〈40K,χ与T的关系偏离居里-外斯定律,表现出顺磁增强现象。法拉第效应研究表明,晶体的Verdet常数的绝对值达到2×103deg/cm.T,采用单振子模型能够很好地拟合实验数据,得出晶体的激子能量E0=1.831eV,说明sp-d交换相互作用引起的激子跃迁对晶体的巨法拉第效应起到主要作用。

英文摘要：

The Cd0.8Mn0.2Te single-crystal ingot was grown by the vertical Bridgman method.The magnetization（M） measurements of Cd0.8Mn0.2Te sample was performed at 2K under external magnetic field（H） from-1592-1592kA/m,and at 796A/m from 2-200K with magnetic field cooling and without magnetic field cooling respectively,using the superconducting quantum interference device（SQUID） magnetometer.Faraday rotation as a function of photon energy for Cd0.8Mn0.2Te crystal was measured at 300K under magnetic field less than 0.2T.The M-H analysis indicates that there is an antiferromagnetic interaction between Mn2＋ ions in the crystal.The results of susceptibility vs temperature fit Curie-Weiss laws at temperatures above 40K and a deviation from the Curie-Weiss law at temperatures from 2-40K,which indicate Cd0.8Mn0.2Te crystal possess paramagnetic properties in the temperature range from 2-200 K and the paramagnetism enhances with the temperature decrease below 40K.The results of Faraday rotation show that Cd0.8Mn0.2Te has a Verdet constant up to 2×103deg/（cm·T） and a single-oscillator model fits the data very well with the exciton energy E0=1.831eV,which proves that the sp-d exchange interaction is the main reason that introduces Faraday rotation to Cd0.8Mn0.2Te.