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

Abstract

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.

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

References in corpus (3)

• The "devil's staircase" type phase transition in NaV2O5 under high pressure
• Structure determination, valence, and superexchange in the dimerized low temperature phase of alpha'-NaV2O5
• Exact diagonalisation study of charge order in the quarter-filled two-leg ladder system NaV2O5

Cited by in corpus (11)

• Magnetic light scattering in low-dimensional quantum spin systems
• X-ray anomalous scattering investigations on the charge order in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$
• Low energy excitations and dynamic Dzyaloshinskii-Moriya interaction in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$ studied by far infrared spectroscopy
• Optical properties, electron-phonon coupling, and Raman scattering of vanadium ladder compounds
• Ordering in Two-Dimensional Ising Models with Competing Interactions
• Simultaneous Charge Ordering and Spin Dimerization in Quasi-Two-Dimensional Quarter-Filled Ladders
• Creation and destruction of a spin gap in weakly coupled quarter-filled ladders
• Charge order induced by electron-lattice interaction in NaV2O5
• On the Stacking Charge Order in NaV2O5
• The Spin-SAF transition in NaV2O5 induced by spin-pseudospin coupling
• Electronic Properties of α'-NaV_2O_5