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28 March 2024
 
  » arxiv » cond-mat/0312174

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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 ;
Date 5 Dec 2003
Journal Phys. Rev. Lett. 92, 247001 (2004)
Subject Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el
AbstractThe 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.
Source arXiv, cond-mat/0312174
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