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26 April 2024 |
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Charge-ordering phase transition and order-disorder effects in the Raman spectra of NaV2O5 | | M.J.Konstantinovic
; M.Isobe
; Y.Ueda
; | | Date: |
26 Jun 2000 | | Journal: | PRB 63, 100303 (2001) | | Subject: | Strongly Correlated Electrons; Disordered Systems and Neural Networks | cond-mat.str-el cond-mat.dis-nn | | Abstract: | In the ac polarized Raman spectra of NaV2O5 we have found anomalous phonon broadening, and an energy shift of the low-frequency mode as a function of the temperature. These effects are related to the breaking of translational symmetry, caused by electrical disorder that originates from the fluctuating nature of the V {4.5+} valence state of vanadium. The structural correlation length, obtained from comparisons between the measured and calculated Raman scattering spectra, diverges at T< 5 K, indicating the existence of the long-range charge order at very low temperatures, probably at T=0 K. | | Source: | arXiv, cond-mat/0006408 | | Services: | Forum | Review | PDF | Favorites | |
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