Cluster glass magnetism in the phase-separated Nd2/3Ca1/3MnO3 perovskite

► Cluster-glass magnetic state of Nd2/3Ca1/3MnO3 below Tg∼60 K has been revealed. ► Magnetic fields up to about μ0H∼0.4 T suppress the glassy magnetic state. ► Extremely broad distribution of relaxation times has been found below Tg. ► The relaxation mechanisms below and above Tg are found to be strongly different. ► Cluster-glass magnetic behavior of Nd2/3Ca1/3MnO3 is associated with its phase segregated state.