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

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

2003-12-05

arxiv.org/abs/cond-mat/0312174v3

Phys. Rev. Lett. 92, 247001 (2004)

Physics

Condensed Matter

Superconductivity

4 pages with 3 figures, changed content

Scientific paper

10.1103/PhysRevLett.92.247001

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. 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. The strong coupling between the Na ions and the holes is emphasized.

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