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

Maw Lin Foo; Yayu Wang; Satoshi Watauchi; H. W. Zandbergen; Tao He; R. J. Cava; N. P. Ong

doi:10.1103/PhysRevLett.92.247001

paper

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

arXiv:cond-mat/0312174 · doi:10.1103/PhysRevLett.92.247001

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. 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.

4 pages with 3 figures, changed content

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