Abstract
The static and dynamic features of magnetization have been investigated in terms of dcmagnetization, ac susceptibility, and memory effects on single-layered perovskiteLa0.7Sr1.3CoO4. The results indicate that short-range ferromagnetic clusters coexistwith the glassy magnetic state, i.e., a cluster–glass phase betweenTf andTG and a spin-glass-likephase below Tf. The clear evidence of memory effects in the dc magnetization is also observed belowTf andTG, respectively. These two glassy states with cooperative relaxation processes mayderive from the different interaction processes among nanoscale ferromagneticclusters mediated by the matrix, which is influenced by changing the spin state ofCo3 + ions in spontaneously phase-separated cobaltite.
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