The observation of gapped quasiparticles near the metal-insulator transition in Nax CoO2

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

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Utilizing high-resolution photoemission spectroscopy (ARPES) with fine-tuned polarization selection we present a systematic study of the insulating cobaltates. A single-particle gap opening is observed, suggesting an anisotropic particle-hole instability is present due to the material's unique topology. 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.

    Original languageEnglish (US)
    Pages (from-to)2986-2988
    Number of pages3
    JournalJournal of Physics and Chemistry of Solids
    Volume69
    Issue number12
    DOIs
    StatePublished - Dec 2008

    Keywords

    • C. Photoelectron spectroscopy
    • D. Fermi surface
    • D. Spin-density waves

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics

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