Stacking faults and metallic properties for the triangular lattice system CoO(2), which has basically three oxygen layers with a prismatic oxygen environment between the layers, have been explored mainly through measurements of nuclear magnetic and quadrupole resonance. A significant distribution of the quadrupole frequency for (59)Co nuclei, due to stacking faults and short atomic coherence, is found. The spin dynamics is successfully understood in terms of the relaxation mechanism for a weakly correlated metal system.
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