Spatially limited antiferromagnetic order in a cluster glass compound Tb2Ni0.90Si2.94
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Date
2019-05-15
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Publisher
Elsevier
Abstract
In the present study, the synthesis of a new ternary intermetallic compound Tb2Ni0.90Si2.94 has been reported. The detailed studies on structure, static and dynamical magnetic properties of the compound have been investigated by means of powder x-ray diffraction, compositional analysis, dc & ac magnetization, non-equilibrium dynamics, heat capacity and neutron diffraction measurements. The dc & ac magnetic susceptibility reveal that the compound undergoes spin cluster-glass behaviour below 9.9 K. The frequency dependence of the freezing temperature have been analysed on the basis of dynamic scaling laws such as power-law divergence and Vogel-Fulcher law, which further confirm the cluster-glass state formation for the compound. A detailed study on non-equilibrium dynamical behaviour associated with cluster-glass state has been carried out through magnetic relaxation behaviour along with magnetic memory effect in zero-field-cooled (ZFC) as well as field-cooled (FC) conditions and associated aging effect. The zero-field neutron diffraction study reveals the presence of a spatially limited antiferromagnetic phase in addition to the magnetically frustrated cluster-glass state. This result has also been supported through zero-field heat capacity studies. The variation in local electronic environment among the magnetic rare-earth ions caused by the structural disorder associated with Ni/Si ions have been argued to be responsible for the coexistence of different magnetic phases. © 2019 Elsevier B.V.
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Keywords
X-ray diffraction, Spin glass state, Antiferromagnetic materials, Magnetization, Neutron diffraction, Intermetallic compounds
Citation
Pakhira, S., Mazumdar, C., Avdeev, M., Bhowmik, R. N., Ranganathan, R. (2019). Spatially limited antiferromagnetic order in a cluster glass compound Tb2Ni0.90Si2.94. Journal of Alloys and Compounds, 785, 72-79, doi:10.1016/j.jallcom.2019.01.123