Are cobaltates conventional? An ARPES viewpoint

M. Z. Hasan, D. Qian, M. L. Foo, R. J. Cava

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7 Scopus citations


Recently discovered class of cobaltate superconductors (Na0.3CoO2·nH2O) is a novel realization of interacting quantum electron system in a triangular network with low-energy degrees of freedom. We employ angle-resolved photoemission spectroscopy to study the quasiparticle parameters in the parent superconductors. Results reveal a large hole-like Fermi surface generated by the crossing of heavy quasiparticles. The measured quasiparticle parameters collectively suggest two orders of magnitude departure from the conventional weak coupling (such as Al) Bardeen-Cooper-Schrieffer electron dynamics paradigm and unveils cobaltates as a rather hidden class of relatively high temperature superconductors. These parameters also form the basis for a microscopic Hamiltonian of the system.

Original languageEnglish (US)
Pages (from-to)1568-1574
Number of pages7
JournalAnnals of Physics
Issue number7
StatePublished - Jul 2006

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


  • Cobaltates
  • Correlated electron systems
  • Photoemission spectroscopy
  • Superconductivity


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