Stacking faults and metallic properties for the triangular lattice system CoO2, which had basically three oxygen layers with a prismatic oxygen environment between the layers, were explored mainly through measurements of nuclear magnetic and quadrupole resonance. A significant distribution of the quadrupole frequency for 59Co nuclei, due to stacking faults and short atomic coherence, was found. The spin dynamics was successfully understood in terms of the relaxation mechanism for a weakly correlated metal system.

Microscopic Evidence for the Stacking Faults and Metallic Properties of a Triangular Lattice CoO2 with a Three-Layer Structure. M.Onoda, A.Sugawara: Journal of Physics - Condensed Matter, 2010, 22[3], 035602