Abstract
The effects of doping with magnetic Mn ions or nonmagnetic Ga ionson the structural, electrical transport and magnetic properties ofNa0.75CoO2 have been investigated. It has been found that the lattice parameterc of the samples increases with Ga or Mn ion doping. Ga doping raises the electrical resistivity ofNa0.75CoO2, but the metallic conducting behaviour of the compound has not been influenced. Incontrast, 5% Mn doping leads to a metal–insulator transition at low temperatures inNa0.75Co1−yMnyO2. The susceptibility of the Ga doped sample shows strong magnetic field dependence, whilethe susceptibility of the Mn doped samples is not very sensitive to the magneticfield. This work implies that magnetic interaction plays an important role inNaxCoO2.
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