Abstract
A defect perovskite oxide LaNiO2.7 ± 0.01 possesses weak spontaneous magnetization below about 220 K. The magnetic susceptibility in a low magnetic field shows a cusp at this temperature. Remarkable magnetic field cooling effects and time-dependent decay of the thermoremanent magnetization are also observed at lower temperatures. We interpret these non-equilibrium magnetic behaviors qualitatively with a model of ferromagnetic clusters with various dimensions.
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