ARPES onNa0.6CoO2: Fermi Surface and Unusual Band Dispersion

2003/10/22 by H. -B. Yang, Huanan Yang, S.-C. Wang +16 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Advanced Thermoelectric Materials and Devices #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.92.246403

published as Phys. Rev. Lett. 92, 246403 (2004) · 4 figures

arxiv created 2003/10/22 · openalex publication_date 2004/06/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

The electronic structure of single crystals Na_0.6CoO₂, which are closely related to the superconducting Na_0.3CoO₂\ifmmode⋅\else\textperiodcentered\fiyH₂O (T_c\ensuremath∼5 K), is studied by angle-resolved photoelectron spectroscopy. While the measured Fermi surface (FS) is consistent with the large FS enclosing the \ensuremathΓ point from the band theory, the predicted small FS pockets near the K points are absent. In addition, the band dispersion is found to be highly renormalized, and anisotropic along the two principal axes (\ensuremathΓ\mathrm\text\ensuremath-K, \ensuremathΓ\mathrm\text\ensuremath-M). Our measurements also indicate that an extended flatband is formed slightly above E_F along \ensuremathΓ\mathrm\text\ensuremath-K.

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