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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 | 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 {f b}-axis, consistent with the symmetry of the P2/b space group. | Source: | arXiv, cond-mat/9907218 | Services: | Forum | Review | PDF | Favorites |
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