Charge-ordering phase transition and order-disorder effects in the Raman spectra of NaV2O5

Article

关键词: SPIN-PEIERLS-TRANSITION;    COMPOUND NAV2O5;    ALPHA'-NAV2O5;    SCATTERING;    ALPHA-NAV2O5;    TEMPERATURE;    CUGEO3;    GAP;    NA;   

DOI  :  10.1103/PhysRevB.63.100303

来源: SCIE

【 摘 要 】

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 V4.5+ 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.

【 授权许可】

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