Abstract
We have investigated the electronic structure of K0.5CoO2 in the metallic phase by high-resolution angle-resolved photoemission spectroscopy at a low temperature. An observed Fermi surface of K0.5CoO2 was a large hexagonal one around the Γ point only, with no hole pockets on the Γ–K lines which was typically predicted by band-structure calculations with local-density approximation (LDA). We also found that a modulation of the Fermi velocity, which was the largest at K point and the smallest at M point, was again opposite to the prediction by LDA band-theory. In spite of this conflicting with LDA band-theory, our results are both in agreement with what was observed in NaxCoO2.
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