Feher A. Direct evidence of the low-temperature cluster-glass magnetic state of Nd2/3Ca1/3MnO3 perovskite / A. Feher, V. Desnenko, E. Fertman, S. Dolya, M. Kajňaková, A. Beznosov // Физика низких температур. - 2012. - Т. 38, № 7. - С. 828-832. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2012_38_7_14
In the presented study we have revealed a giant exchange bias in a colossal magnetoresistance Nd2/3Ca1/3MnO3 perovskite at low temperatures, evident of an intrinsic exchange coupling in this compound. The phenomena found confirms our previous assumption that the low-temperature magnetic structure of the compound is represented by small (nanosized) ferromagnetic clusters immersed within the charge-ordered antiferromagnetic matrix. Magnetic behavior of the Nd2/3Ca1/3MnO3 perovskite is consistent with a cluster-glass magnetic state and does not agree with a classical spin-glass state observed in a variety of disordered magnetic systems. We think that the cluster-glass magnetic behavior of Nd2/3Ca1/3MnO3 originates from the self-organized phase-separated state of the compound. The Cole-Cole analysis of the dynamic susceptibility at lowtemperatures has shown extremely broad distribution of relaxation times, indicating that spins are frozen at a "macroscopic" time scale. Slow relaxation of the zero-field-cooled magnetization has been experimentally revealed as well. This slow relaxation confirms the cluster-glass magnetic state of the compound. Two strongly different relaxation mechanisms were found: the first one is characteristic for temperatures below the freezing temperature Tg ~ 60 K, the second one is characteristic for higher temperatures. Цитованість авторів публікації:Feher A.Desnenko V.
Fertman E.
Dolya S.
Kajňaková M.
Beznosov A.
Бібліографічний опис для цитування: Feher A. Direct evidence of the low-temperature cluster-glass magnetic state of Nd2/3Ca1/3MnO3 perovskite / A. Feher, V. Desnenko, E. Fertman, S. Dolya, M. Kajňaková, A. Beznosov // Физика низких температур. - 2012. - Т. 38, № 7. - С. 828-832. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2012_38_7_14.
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