Absence of ferromagnetism and strong spin-orbital coupling in polycrystalline in and Co codoped Zn1-xCo0.075In xO oxide

Polycrystalline samples of In and Co codoped ZnO (Zn_1-xIn_xCo_0.075O; 0.010≤x≤0.020) oxide were prepared by solid-state synthesis technique. Phase purity and structure refinement done by means of the Rietveld analysis technique shows that both Co and In substitute properly into Zn positions. In doping, increased bulk conductivity of the samples at room temperature indicates an increase of charge carrier concentration. All samples showed paramagnetic behavior following Curie-Weiss law at close to room temperatures, with short range antiferromagnetic interaction with Θ≈-200 K. Effective magnetic moment (μ_eff) calculations showed a strong orbital contribution to the value of μ_eff, increasing with an increase of In content (x).