Observation of gapped quasiparticles in sodium charge-ordered Na1/2CoO2

Y. Xia, D. Qian, D. Hsieh, L. Wray, L. Viciu, R. J. Cava, M. Z. Hasan

    Research output: Contribution to journalArticle

    Abstract

    Using high-resolution photoemission spectroscopy (ARPES), we present a systematic study of the insulating cobaltates. A single-particle gap opening suggests that due to the material's unique topology an anisotropic particle-hole instability is present. Unlike conventional density waves, charge stripes or band insulators, the onset of the gap depends on the quasiparticle's quantum coherence which occurs well below the symmetry-breaking temperature of the crystal. Results are found to be in good agreement with bulk resistivity, specific heat and optical measurements.

    Original languageEnglish (US)
    Pages (from-to)1007-1009
    Number of pages3
    JournalPhysica B: Condensed Matter
    Volume403
    Issue number5-9
    DOIs
    StatePublished - Apr 1 2008

    Fingerprint

    Charge density waves
    Crystal symmetry
    Photoelectron spectroscopy
    Specific heat
    Sodium
    sodium
    Topology
    Crystals
    optical measurement
    broken symmetry
    photoelectric emission
    heat measurement
    topology
    insulators
    specific heat
    Temperature
    electrical resistivity
    high resolution
    spectroscopy
    crystals

    Keywords

    • Frustrated systems
    • Metal-insulator transition
    • Mott insulator
    • Sodium cobaltate
    • Triangular lattice

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics

    Cite this

    Xia, Y., Qian, D., Hsieh, D., Wray, L., Viciu, L., Cava, R. J., & Hasan, M. Z. (2008). Observation of gapped quasiparticles in sodium charge-ordered Na1/2CoO2 . Physica B: Condensed Matter, 403(5-9), 1007-1009. https://doi.org/10.1016/j.physb.2007.10.276

    Observation of gapped quasiparticles in sodium charge-ordered Na1/2CoO2 . / Xia, Y.; Qian, D.; Hsieh, D.; Wray, L.; Viciu, L.; Cava, R. J.; Hasan, M. Z.

    In: Physica B: Condensed Matter, Vol. 403, No. 5-9, 01.04.2008, p. 1007-1009.

    Research output: Contribution to journalArticle

    Xia, Y, Qian, D, Hsieh, D, Wray, L, Viciu, L, Cava, RJ & Hasan, MZ 2008, 'Observation of gapped quasiparticles in sodium charge-ordered Na1/2CoO2 ', Physica B: Condensed Matter, vol. 403, no. 5-9, pp. 1007-1009. https://doi.org/10.1016/j.physb.2007.10.276
    Xia, Y. ; Qian, D. ; Hsieh, D. ; Wray, L. ; Viciu, L. ; Cava, R. J. ; Hasan, M. Z. / Observation of gapped quasiparticles in sodium charge-ordered Na1/2CoO2 . In: Physica B: Condensed Matter. 2008 ; Vol. 403, No. 5-9. pp. 1007-1009.
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