MEM Charge Density Analysis of Orbital-Ordering of Nd_<0.35>Sr_<0.65>MnO_3(Condensed Matter : Structure, Mechanical and Thermal Properties)

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The charge density distribution of Nd_<0.35>Sr_<0.65>MnO_3 has been investigated by means of the maximum entropy method (MEM) using the synchrotron radiation (SR) X-ray powder diffraction data. In this compound, the anisotropic optical spectra reported by Tobe et al. [Phys. Rev. B67 (2003) 140402(R)] suggest that the d_<3z^2-r^2> orbital-ordering survives even at 600K (≫T_N=260K). Consistently, we observed an anisotropic charge density distribution around the Mn ion at 30K (≪T_N), indicating the long-range ordering of the d_<3z^2-r^2> orbital. At 300K (≥T_N), however, the charge density distribution becomes isotropic, suggesting the disappearance of the long-range orbital ordering.
社団法人日本物理学会の論文
2005-08-15