Low temperature phase transitions and crystal structure of Na0.5CoO2

Details Low temperature phase transitions and crystal structure of Na0.5CoO2 Low temperature phase transitions and crystal structure of Na0.5CoO2

2004-02-09

arxiv.org/abs/cond-mat/0402255v2

Physics

Condensed Matter

Strongly Correlated Electrons

19 pages, 10 figures, submitted to Journal of Physics: Condensed Matter. Revised structural parameters on page 7

Scientific paper

10.1088/0953-8984/16/32/016

The crystal structure of Na0.5CoO2, determined by powder neutron diffraction, is reported. The structure consists of layers of edge-shared CoO6 octahedra in a triangular lattice, with Na ions occupying ordered positions in the interleaving planes. The Na ions form one-dimensional zigzag chains. Two types of Co ions, which differ only subtly in their coordination by oxygen, are also found in chains. Specific heat measurements show that the transitions observed at 87 K and 53 K in the resistivity and magnetic susceptibility are accompanied by changes in entropy. Electron diffraction studies suggest that the 87K transition may have a structural component.

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