Charge ordering signatures in the optical properties of beta-Na0.33V2O5

Details Charge ordering signatures in the optical properties of beta-Na0.33V2O5 Charge ordering signatures in the optical properties of beta-Na0.33V2O5

2002-11-28

arxiv.org/abs/cond-mat/0211653v1

Physical Review Letters 90, 026402 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

To be published in PRL

Scientific paper

10.1103/PhysRevLett.90.026402

Temperature dependent optical spectra are reported for beta-Na0.33V2O5. The sodium ordering transition at T_Na = 240 K, and in particular the charge ordering transition at T_MI = 136 K strongly influence the optical spectra. The metal-insulator transition at \tmi leads to the opening of a psuedogap (\hbar\omega = 1700 cm-1), and to the appearance of a large number of optical phonons. These observations, and the presence of a mid-infrared band (typical for low dimensional metals) strongly suggests that the charge carriers in beta-Na0.33V2O5 are small polarons.

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