Hole-concentration-induced transformation of the magnetic and orbital structures inNd1−xSrxMnO3
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Abstract
In order to study the magnetic and crystal structures in the Nd{1-x}Sr{x}MnO{3} system, we have peformed neutron diffraction measurements on melt-grown polycrystalline samples with 0.49 1/2, indicating that the energy difference between these two states is extremely small. We also found that the MnO{6} octahedra are apically compressed in the CE-type and A-type AFM states due to the d(3x2-r2)/d(3y2-r2) or d(x2-y2) orbital orderings, respectively, whereas they are apically elongated by the rod-type d(3z2-r2) orbital ordering in the C-type AFM state. In addition, a selective broadening of Bragg peaks was observed in the C-type AFM phase, and its x dependence strongly suggests the charge ordering for a commsurate value of the hole concentration at either x=3/4 or x=4/5.
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