Orthorhombic versus monoclinic symmetry of the charge-ordered state of NaV2O5

Details Orthorhombic versus monoclinic symmetry of the charge-ordered state of NaV2O5 Orthorhombic versus monoclinic symmetry of the charge-ordered state of NaV2O5

2001-08-03

arxiv.org/abs/cond-mat/0108067v2

Physics

Condensed Matter

Materials Science

REVTEX, 4 pages including 2 figures, shortened, submitted to PRL

Scientific paper

10.1103/PhysRevB.65.060101

High-resolution X-ray diffraction data show that the low-temperature superstructure of alpha-NaV2O5 has an F-centered orthorhombic 2a x 2b x 4c 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 devils staircase of the superlattice period along c.

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