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Abstract:
High-resolution x-ray diffraction data show that the low-
temperature superstructure of alpha'-NaV2O5 has an F-centered
orthorhombic 2ax2bx4c superlattice. A structure model is
proposed, that is characterized by layers with zigzag charge
order on all ladders and stacking disorder, such that the
averaged structure has space group Fmm2. This model is in
accordance with both x-ray scattering and NMR data. Variations
in the stacking order and disorder offer an explanation for the
recently observed devil's staircase of the superlattice period
along c.
