Abstract
It is shown that the electronic structure in layered cobalt oxides with hexagonal crystal structure is described as a Kagome lattice hidden in the CoO2 layer which consists of stacked triangular lattices of oxygen ions and of cobalt ones. The Kagome lattice is derived because of the degeneracy of t 2g orbitals. We discuss that the electronic structure causes a variety of unique properties in the cobalt oxides such as superconductivity and ferromagnetism, which are in contrast to the high-T c cuprates.
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