First evidence for charge ordering in NaV${}_2$O${}_5$ from Raman spectroscopy

Abstract

We argue on the basis of symmetry selection rules and Raman scattering spectra that NaV${}_2$O${}_5$ undergoes a charge ordering phase transition at T${}_c$=34 K. Such a transition is characterized by the redistribution of the charges at the phase transition and corresponds to the change of the vanadium ions, from uniform V${}^{4.5+}$ to two different V${}^{4+}$ and V${}^{5+}$ states. In the low temperature phase the V${}^{4+}$ ions are forming a "zig-zag" ladder structure along the {\bf b}-axis, consistent with the symmetry of the P2/b space group.

to be published in solid state communications

References in corpus (7)

• A new view of the electronic structure of the spin-Peierls compound alpha'-NaV2O5
• Charged Magnons in NaV2O5
• Charge ordering and spin- Peierls transition in alpha'-NaV2O5
• Anomalous thermal conductivity of NaV2O5 as compared to conventional spin-Peierls system CuGeO3
• Magnon splitting induced by charge ordering in NaV_2O_5
• Magnetic bound states in the quarter-filled ladder system ${\alpha }^{\prime }-Na{V}_2{O}_5$}
• Raman Scattering in the Inorganic Spin-Peierls System alpha'-Na_{1-delta}V_2O_5

Cited by in corpus (10)

• X-ray anomalous scattering investigations on the charge order in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$
• Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states?
• Raman scattering study of charge ordering in beta-Ca0.33V2O5
• Infrared and Raman spectra of LiV2O5 single crystals
• Orthorhombic versus monoclinic symmetry of the charge-ordered state of NaV2O5
• One-dimensional dynamics of the d-electrons in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$
• Spin-Peierls transition in NaV2O5 in high magnetic fields
• Low-energy excitations in NaV2O5
• Charge-ordering phase transition and order-disorder effects in the Raman spectra of NaV2O5
• Terahertz light driven coherent excitation of a zone-folded Raman-active phonon mode in the Spin-Ladder System ${\alpha }^{\prime }$-NaV${}_2$O${}_5$