Magnetism, Electronic Transport and Infrared Absorption Spectra in Perovskite Manganite La0.67-xDyxCa0.33MnO3 （x=0～0.6）
来源期刊：Journal of Rare Earths2007年第S1期
论文作者：曹晓明 卢遵铭 陈红建 李养贤
文章页码：207 - 210
摘 要：Polycrystalline samples La0.67-xDyxCa0.3MnO3 （x=0～0.6） were prepared by traditional solid-state reaction method. The magnetization and resistivity of the samples were measured by PPMS （Quantum Design）. The infrared absorption spectra （temperature scope: 20～300 K, frequency: 400～4400 cm-1） were collected by WQF-410 Fourier Transform Spectrophotometer. The substitution of Dy on La sites results in a decrease of the Curie temperature Tc and the magnetization, and also induces cluster-glass behaviors. The resistivity of the compounds is enhanced by Dy doped. Infrared absorption spectra provide the evidence of the variety of Mn-O-Mn bond length due to the Dy substitution and temperature changing. These results suggest that all of the magnetic coupling between Dy and Mn sublattice and La-Dy average ionic radius contribute to the magnetic and electronic character.
曹晓明，卢遵铭，陈红建，李养贤
摘 要：Polycrystalline samples La0.67-xDyxCa0.3MnO3 （x=0～0.6） were prepared by traditional solid-state reaction method. The magnetization and resistivity of the samples were measured by PPMS （Quantum Design）. The infrared absorption spectra （temperature scope: 20～300 K, frequency: 400～4400 cm-1） were collected by WQF-410 Fourier Transform Spectrophotometer. The substitution of Dy on La sites results in a decrease of the Curie temperature Tc and the magnetization, and also induces cluster-glass behaviors. The resistivity of the compounds is enhanced by Dy doped. Infrared absorption spectra provide the evidence of the variety of Mn-O-Mn bond length due to the Dy substitution and temperature changing. These results suggest that all of the magnetic coupling between Dy and Mn sublattice and La-Dy average ionic radius contribute to the magnetic and electronic character.
关键词：
