The phase diagram of the layered NaxCoO2 was determined by charge ordering, commensurability and metallicity. The phase diagram revealed a characteristic feature of NaxCoCO2 called the strong influence of the Na ions on the electronic properties. The superconducting state produced by intercalation with H2O evolved from the paramagnetic metal, which was separated from the Curie-Weiss state by the charge-ordered insulator. The large carrier density is ten times larger than in the cuprates doped at 0.3. The larger effective mass may reduce the superfluid density to a value comparable to that observed in the overdoped limit in cuprates.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)