Glassy behavior in the layered perovskites La2−xSrxCoO4(1.1≤x≤1.3)

► Phase segregated state of cobaltite La2−xSrxCoO4 for (1.1≤x≤1.3) to find the origin of the observed glassy behavior. ► Result of the frequency dependent ac susceptibility measurement excludes the possibility of any spin glass phase, hints strong inter-cluster interactions. ► Relaxation experiments confirm the system to be a collection of clusters with two preferred sizes. ► The glassy behavior originates from strong inter-cluster interactions.