ARPES on Na0.6CoO2: Fermi surface and unusual band dispersion.
作者： H.-B. Yang , S.-C. Wang , A. K. P. Sekharan , H. Matsui , S. Souma
DOI: 10.1103/PHYSREVLETT.92.246403
关键词: Pseudogap 、 Strongly correlated material 、 Electronic band structure 、 Fermi level 、 Anisotropy 、 Physics 、 Angle-resolved photoemission spectroscopy 、 Fermi surface 、 Condensed matter physics 、 Dispersion relation
摘要: The electronic structure of single crystals Na0.6CoO2, which are closely related to the superconducting Na0.3CoO2.yH(2)O (T(c) approximately 5 K), is studied by angle-resolved photoelectron spectroscopy. While measured Fermi surface (FS) consistent with large FS enclosing Gamma point from band theory, predicted small pockets near K points absent. In addition, dispersion found be highly renormalized, and anisotropic along two principal axes (Gamma-K, Gamma-M). Our measurements also indicate that an extended flatband formed slightly above E(F) Gamma-K.
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