Charge-ordering, commensurability and metallicity in the phase diagram of layered Na(x)CoO(2)

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  • 5 December 2003
Abstract
The phase diagram of non-hydrated Na(x)CoO(2) has been determined by changing the Na content x using a series of chemical reactions. We find that as x increases from 0.3, the ground state goes from a paramagnetic metal to a charge-ordered insulator (at x=1/2) to a `Curie-Weiss metal' (around 0.70), and finally to a weak-moment magnetically ordered state (x>0.75). The unusual properties of the state at 1/2 (including particle-hole symmetry at low T and enhanced thermal conductivity) are described. Implications for the superconducting phase (when water is intercalated) are discussed.

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