Magnetic and magnetocaloric properties of ${\left({\mathrm{Gd}}_{1-\mathrm{x}}{\mathrm{Y}}_{\mathrm{x}}\right)}_2{\text{NiSi}}_3$ compounds (x = 0.25, 0.5, 0.75)

Journal Article · 05 April 2019 · Journal of Magnetism and Magnetic Materials

DOI: https://doi.org/10.1016/j.jmmm.2019.04.021 · OSTI ID:1526284

Pakhira, Santanu  ^[1]; Mazumdar, Chandan ^[2]; Ranganathan, R. ^[2]

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1. Saha Inst. of Nuclear Physics, Bidhannagar, Kolkata (India); Ames Lab. and Iowa State Univ., Ames, IA (United States)
2. Saha Inst. of Nuclear Physics, Bidhannagar, Kolkata (India)

Here, we report the magnetic dilution effect on the magnetic and magnetocaloric properties of ${\left({\mathrm{Gd}}_{1-\mathrm{x}}{\mathrm{Y}}_{\mathrm{x}}\right)}_2{\text{NiSi}}_3$(x = 0.25, 0.5, 0.75) compounds by partial substitution of Y ions in Gd₂NiSi₃. The X-ray diffraction studies indicate all theses compounds form in AlB₂ type hexagonal crystal structure. The dc magnetic measurements reveal the compounds undergo antiferromagnetic like phase transition below 11.5, 7.2, and 3.1 K for x = 0.25, 0.5 and 0.75 compositions, respectively. The magnetic ground state of the compounds becoming increasingly fragile with the increase in Y concentration, and results in magnetic field induced ferromagnetic transition. Such change in magnetic spin configuration is responsible for moderately large magnetic entropy change (ΔS_M ~ 19.3 J/kg-K, 14.8 J/kg-K and 9.8 J/kg-K for (x = 0.25, 0.5, 0.75), respectively, for ΔH = 7T) in the cryogenic temperature region. The relative cooling power (RCP) has also been measured for all the compounds that appears to be modest (~503 J/kg for 7T magnetic field change) for x = 0.25 analogue and reduces further with magnetic dilution effect caused by Y substitution.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
• Grant/Contract Number: AC02-07CH11358
• OSTI ID: 1526284
• Alternate ID(s): OSTI ID: 1636496
• Report Number(s): IS-J--9948
• Journal Information: Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Journal Issue: C Vol. 484; ISSN 0304-8853
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English