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Issue 10, 2018
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Chemical disorder driven reentrant spin cluster glass state formation and associated magnetocaloric properties of Nd2Ni0.94Si2.94

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Abstract

In this work, we report the synthesis of a new ternary intermetallic compound, Nd2Ni0.94Si2.94, that forms in single phase only in a defect crystal structure. The compound exhibits an antiferromagnetic transition below 7.2 K (TN) followed by a spin cluster freezing behaviour below 2.85 K (Tf), which makes the compound a reentrant spin cluster glass system. The detailed studies of dc and ac magnetization, heat capacity, non-equilibrium dynamical behaviour, viz., aging effect, temperature and field dependent magnetic relaxation and magnetic memory effect establish the compound to be a cluster-glass material below freezing temperature. The interplay between competing exchange coupling (c/a ≃ 1.04 ⇒ JNNJNNN) and chemical disorder driven variation in the electronic environment among the Nd ions has been argued to be responsible for such a metastable state formation. A considerable value of MCE parameters (−ΔSmaxM ∼ 11.4 J kg−1 K−1, RCP ∼ 160 J kg−1 and ΔTad ∼ 5.2 K for a field change of 70 kOe) is obtained for this magnetically frustrated glassy compound.

Graphical abstract: Chemical disorder driven reentrant spin cluster glass state formation and associated magnetocaloric properties of Nd2Ni0.94Si2.94

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Publication details

The article was received on 22 Dec 2017, accepted on 07 Feb 2018 and first published on 07 Feb 2018


Article type: Paper
DOI: 10.1039/C7CP08574E
Citation: Phys. Chem. Chem. Phys., 2018,20, 7082-7092
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    Chemical disorder driven reentrant spin cluster glass state formation and associated magnetocaloric properties of Nd2Ni0.94Si2.94

    S. Pakhira, C. Mazumdar, R. Ranganathan and S. Giri, Phys. Chem. Chem. Phys., 2018, 20, 7082
    DOI: 10.1039/C7CP08574E

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