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29 March 2024
 
  » arxiv » cond-mat/9907218

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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 ;
Date 15 Jul 1999
Journal solid.state.comm. 112, 397 (1999)
Subject Strongly Correlated Electrons | cond-mat.str-el
AbstractWe 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 {f b}-axis, consistent with the symmetry of the P2/b space group.
Source arXiv, cond-mat/9907218
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