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

M. J. Konstantinovic; Z. V. Popovic; A. N. Vasil'ev; M. Isobe; Y. Ueda

doi:10.1016/S0038-1098(99)00338-5

paper

First evidence for charge ordering in NaV $_{2}$ O $_{5}$ from Raman spectroscopy

arXiv:cond-mat/9907218 · doi:10.1016/S0038-1098(99)00338-5

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

First evidence for charge ordering in NaV2​O5​ from Raman spectroscopy

Abstract

First evidence for charge ordering in NaV $_{2}$ O $_{5}$ from Raman spectroscopy