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A detailed study of the low-temperature magnetic state and the relaxation inthe phase-separated colossal magnetoresistance Nd2/3Ca1/3MnO3 perovskite hasbeen carried out. Clear experimental evidence of the cluster-glass magneticbehavior of this compound has been revealed. Well defined maxima in thein-phase linear ac susceptibility $\chi ^{/}(T)$ were observed, indicative ofthe magnetic glass transition at $T_{g}$ = 60 K. Strongly divergentzero-field-cooled and field-cooled static magnetizations and frequencydependent ac susceptibility are evident of the glassy-like magnetic state ofthe compound at low temperatures. The frequency dependence of the cusptemperature Tmax of the $\chi ^{/}(T)$ susceptibility was found to follow thecritical slowing down mechanism. The Cole-Cole analysis of the dynamicsusceptibility at low temperature has shown extremely broad distribution ofrelaxation times, indicating that spins are frozen at "macroscopic" time scale.Slow relaxation in the zero-field-cooled magnetization has been experimentallyrevealed. The obtained results do not agree with a canonical spin-glass stateand indicate a cluster glass magnetic state of the compound below $T_{g}$,associated with its antiferromagnetic-ferromagnetic nano-phase segregatedstate. It was found that the relaxation mechanisms below the cluster glassfreezing temperature $T_{g}$ and above it are strongly different. Magneticfield up to about $\mu_{0}$H = 0.4 T suppresses the glassy magnetic state ofthe compound.

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