Infrared Spectra of La_(0.65)Ba_xMnO_(3-δ) Oxides

查看全文 作　　者：Jifan Hu1, Hongwei Qjn 1), Yanming Hao2, Yangxian Li2, Yizhong Wang3), Zhenxi Wan g3) 1) Department of Physics, Shandong University, Jinan 250100, China 2) School of Electronic Engineering and Material Science, Hehei University of Technology. Tianjing 30 出　　处：《Rare Metals》索引2001年第20卷第4期,共4页 基　　金：This work was financially supported by the Trans-Century Foundation of the Educational Ministry of China and by the National Nat 摘　　要：The infrared spectra of La0.65BaxMnO(3-|?￡(c) (x = 0.35, 0.33 and 0.30) were investigated experimentally. The result shows that the sample La0.65BaxMnO(3-|?￡(c) has the largest Curie temperature and the smallest resistivity and wave number of the stretching vibration mode of MnO6 octaheUron at 300 K among the investigated samples. However, the absorption strength for the stretching vibration mode of Mn06 octahedron in La0.65BaxMnO(3-|?￡(c) is stronger for parainagnetic phase than that for ferromagnelic phase, which may be connected with the reducing of the dynamic in- coherent Jahn-Teller distortion below Curie temperature. In addition, the large shift of wave number for the stretching mode at the temperatures from 293 to 423 K has been observed in La0.65BaxMnO(3-|?￡(c), which may be due to the in- crease of the Mn-O bond length with temperature increasing. 关 键 词：infrared spectra colossal magnetoresistance effect perovskite manganite stretching vibration mode Jahn-Teller distortion