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

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

1999-07-15

arxiv.org/abs/cond-mat/9907218v1

solid.state.comm. 112, 397 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

to be published in solid state communications

Scientific paper

10.1016/S0038-1098(99)00338-5

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.

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