Abstract
The structural and magnetic properties of Ba0.8La0.2Ti1−xCoxO3 (0 ≤ x ≤ 0.2) have been investigated. All samples show a cubic structure with the space group of Pm3m at room temperature. Ba0.8La0.2TiO3 exhibits a carrier induced Pauli-paramagnetism and Ba0.8La0.2Ti0.9Co0.1O3 shows a Curie-Weiss like paramagnetism. With increasing cobalt doping, Ba0.8La0.2Ti0.8Co0.2O3 seems to undergo a spin glass like transition at Tf = 10.1 K as evidenced by the frequency dependence of ac susceptibility measurements, aging effect measurements, memory effect measurements and magnetic relaxation measurements. The time decay of the thermoremnant magnetization can be well described with the stretched exponential function. It is worthwhile to note that the temperature dependence of relaxation characteristic time τr and the critical exponent n deduced from the function show opposite tendencies below and above Tf, and the possible reason has been discussed. n at Tf close to 2/3 suggests that Ba0.8La0.2Ti0.8Co0.2O3 may be a three dimensional Ising spin glass.
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