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Phys. Rev. Lett. 92, 247001 (2004) [4 pages]

Charge Ordering, Commensurability, and Metallicity in the Phase Diagram of the Layered NaxCoO2

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Maw Lin Foo1, Yayu Wang2, Satoshi Watauchi1,*, H. W. Zandbergen3,4, Tao He5, R. J. Cava1,3, and N. P. Ong2,3
1Department of Chemistry, Princeton University, New Jersey 08544, USA
2Department of Physics, Princeton University, New Jersey 08544, USA
3Princeton Materials Institute, Princeton University, New Jersey 08544, USA
4National Center for HREM, Laboratory of Materials Science, Delft University of Technology, The Netherlands
5DuPont Central Research and Development Experimental Station, Wilmington, Delaware 19880, USA

Received 16 December 2003; published 14 June 2004

The phase diagram of nonhydrated NaxCoO2 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), then 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.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.247001
DOI:
10.1103/PhysRevLett.92.247001
PACS:
74.25.Fy, 71.10.Hf, 71.30.+h, 72.15.Gd

*Permanent address: Center for Crystal Science and Technology, University of Yamanashi, 7 Miyamae, Kofu, Yamanashi 400-8511, Japan.

 
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