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Published in:
2006 | OriginalPaper | Chapter
Electronic State in Co-Oxide-Similar to Cuprates?
Authors : S. Maekawa, W. Koshibae
Published in: Symmetry and Heterogeneity in High Temperature Superconductors
Publisher: Springer Netherlands
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It is shown that the electronic structure in layered cobalt oxides with hexagonal crystal structure is described as a Kagomé lattice hidden in the CoO2 layer which consists of stacked triangular lattices of oxygen ions and of cobalt ones. The Kagomé lattice is derived because of the degeneracy of t2g 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-Tc cuprates.