The evidence of the glassy behavior in the layered cobaltites

Abstract

In this letter, we demonstrate that the origin of the glassy behavior in the phase-separated layered cobaltites cannot be simply ascribed to intercluster interactions as the phase-separated manganites can. Instead, our result indicates that both the intercluster interactions and a spin glass phase contribute to the glassy behaviors. Thus, this study distinguishes the picture of phase separation between cobaltites and manganites. We also observe training effect of the exchange bias, which can be interpreted by a spin configurational relaxation model.