Cluster spin-glass-like dynamics in Mn-rich La2Ni0.5Mn1.5O6ferromagnetic insulator.
J Phys Condens Matter
; 33(22)2021 May 07.
Article
em En
| MEDLINE
| ID: mdl-33784641
ABSTRACT
We report on the physical properties of Mn-rich, nonstoichiometric La2Ni0.5Mn1.5O6ferromagnetic insulator, prepared by sol-gel method. The single-phase orthorhombicPbnmstructure for the compound was confirmed by x-ray diffraction measurements. Dc magnetization measurements revealed a high saturation magnetization of â¼5.95 µB/f.u. at 5 K, and a ferromagnetic to paramagnetic transition at â¼162 K. Ac magnetic susceptibility measurements confirmed a broad frequency-dependent anomaly at lower temperatures indicating the presence of spin-glass type magnetic interactions. The ac susceptibility data have been discussed within the framework of the critical slowing down model and Vogel-Fulcher law, and confirmed the cluster spin-glass dynamics with a relaxation time of the order of 10-5 s. The valence of Ni and Mn ions was verified from the x-ray absorption near edge structure spectroscopy. The origin of cluster spin-glass state was discussed in terms of several possible magnetic exchange interaction pathways among Ni and Mn ions.
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01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
J Phys Condens Matter
Ano de publicação:
2021
Tipo de documento:
Article