Patterning of sodium ions and the control of electrons in sodium cobaltate

M. Roger (), D. J. P. Morris, D. A. Tennant, M. J. Gutmann, J. P. Goff, J.-U. Hoffmann, R. Feyerherm, E. Dudzik, D. Prabhakaran, A. T. Boothroyd, N. Shannon, B. Lake and P. P. Deen
Additional contact information
M. Roger: DSM/DRECAM/SPEC, CEA Saclay
D. J. P. Morris: University of Liverpool, Oliver Lodge Laboratory
D. A. Tennant: Hahn-Meitner Institut
M. J. Gutmann: ISIS Facility, Rutherford Appleton Laboratory
J. P. Goff: University of Liverpool, Oliver Lodge Laboratory
J.-U. Hoffmann: Hahn-Meitner Institut
R. Feyerherm: Hahn-Meitner Institut
E. Dudzik: Hahn-Meitner Institut
D. Prabhakaran: Clarendon Laboratory
A. T. Boothroyd: Clarendon Laboratory
N. Shannon: University of Bristol
B. Lake: Hahn-Meitner Institut
P. P. Deen: European Synchrotron Radiation Facility

Nature, 2007, vol. 445, issue 7128, 631-634

Abstract: Sodium ions in control The remarkable electronic and thermal properties of sodium cobaltate have made it a focus of much attention: it becomes superconducting when water molecules are interleaved between the cobalt oxide sheets, it has novel magnetic properties and high thermoelectric power. Recent work on the origin of these properties has highlighted unusual sodium ion patterning in the intercalation layers, and a new neutron diffraction and computational modelling study throws further light on the patterns and mechanisms of sodium ordering in this material. Na+ patterning is found to induce periodic fluctuations in Coulomb potential, which could play a decisive role in the transport and magnetic properties of sodium cobaltate. This work suggests the possibility of switching electron flow at the nanoscale by chemical and biochemical reactions with sodium.

Date: 2007
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DOI: 10.1038/nature05531

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