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 journalArticle

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 1 2008

All Science Journal Classification (ASJC) codes

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

Keywords

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

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