Abstract
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. B 67 (2003) 140402(R)] suggest that the d 3 z 2 - r 2 orbital-ordering survives even at 600 K (≫ T N = 260 K). Consistently, we observed an anisotropic charge density distribution around the Mn ion at 30 K (≪ T N ), indicating the long-range ordering of the d 3 z 2 - r 2 orbital. At 300 K (≥ T N ), however, the charge density distribution becomes isotropic, suggesting the disappearance of the long-range orbital ordering.
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