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  • Title: Infrared spectroscopy of the charge ordering transition of Na0.5CoO2.
    Author: Wang NL, Wu D, Li G, Chen XH, Wang CH, Luo XG.
    Journal: Phys Rev Lett; 2004 Oct 01; 93(14):147403. PubMed ID: 15524841.
    Abstract:
    We report infrared reflectivity study of charge ordering in a Na0.5CoO2 single crystal. In comparison with x=0.7 and 0.85 compounds, we found that the effective carrier density increases systematically with decreasing Na contents. The charge ordering transition only affects the optical spectra below 1000 cm(-1). A hump near 800 cm(-1) develops below 100 K, which is accompanied by the appearance of new lattice modes as well as the strong antiresonance feature of phonon spectra. These observations signify a polaronic characteristic of charge carriers. Below T(co), an optical gap develops at the magnitude of 2Delta approximately 3.5k(B)T(co) (T<<T(co)), evidencing an insulating charge density wave ground state.
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