%A Liu Zi-Xin(刘自信), Wen Sheng-Hui(文生辉), and Li Ming(李明) %T Generalization of iterative perturbation theory and coherent potential approximation (ITP+CPA) to double exchange model with orbital degeneracy %0 Journal Article %D 2008 %J Chin. Phys. B %R 10.1088/1674-1056/17/6/057 %P 2277-2280 %V 17 %N 6 %U {https://cpb.iphy.ac.cn/CN/abstract/article_109936.shtml} %8 2008-06-20 %X A combination of the iterative perturbation theory (ITP) of the dynamical mean field theory (DMFT) and coherent-potential approximation (CPA) is generalized to the double exchange model with orbital degeneracy. The Hubbard interaction and the off-diagonal components for the hopping matrix $t_{ij}^{mn} (m \ne n)$ are considered in our calculation of spectrum and optical conductivity. The numerical results show that the effects of the non-diagonal hopping matrix elements are important.