ARPES on Na0.6CoO2: Fermi surface and unusual band dispersion |
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| Authors: | Yang H-B Wang S-C Sekharan A K P Matsui H Souma S Sato T Takahashi T Takeuchi T Campuzano J C Jin R Sales B C Mandrus D Wang Z Ding H |
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| Institution: | Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA. |
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| Abstract: | 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 the measured Fermi surface (FS) is consistent with the large FS enclosing the Gamma 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 (Gamma-K, Gamma-M). Our measurements also indicate that an extended flatband is formed slightly above E(F) along Gamma-K. |
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