Structure and Physical Properties and Charge Ordering in La2-xSrxMnO4 (1.125 ≤ x ≤ 2.0)
FENG Zhen-Jie1,2, DONG Cheng1, LI Zhi-Chao2, LI Jian-Qi3
1National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2Department of Material Science, Liaoning Technical University, Fuxin 123000
3Beijing Laboratory of Electron Microscopy, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
Structure and Physical Properties and Charge Ordering in La2-xSrxMnO4 (1.125 ≤ x ≤ 2.0)
1National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2Department of Material Science, Liaoning Technical University, Fuxin 123000
3Beijing Laboratory of Electron Microscopy, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
Abstract： Structural measurements have revealed nonlinear changes of lattice parameters in the layered-perovskite manganites La2-xSrxMnO4 with increasing Sr content; these changes can be well understood by means of interactions among the charge, crystal lattice and the orbital degree of freedom in this strongly correlated system. A probably spin-glass transition was detected for the first time in the x = 1.75 sample at the temperature of around 44 K. Fundamental properties of charge ordering appearing in the range of 1.5 ≤ x ≤ 1.75 have been observed at low-temperatures and are interpreted in terms of the Mn3+-dz2 orbital ordering.
2004, Vol. 21 
