Griffiths-like behavior and magnetocaloric properties of rare-earth silicide Tb 2 Co 0.8 Si 3.2 .

Autor: U D R; Intermetallics and Non-Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India., K A; Intermetallics and Non-Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India., S S; Intermetallics and Non-Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India., S R A; Intermetallics and Non-Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India., Dzubinska A; CPM-TIP, University Pavol Jozef Safarik, 04011 Košice, Slovakia., Reiffers M; Faculty of Humanities and Natural Sciences, Presov University, Presov, Slovakia.; Institute of Experimental Physics, SAS, Kosice, Slovakia., Ramamoorthi N; Intermetallics and Non-Linear Optics Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India.
Jazyk: angličtina
Zdroj: Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2024 Feb 15; Vol. 36 (19). Date of Electronic Publication: 2024 Feb 15.
DOI: 10.1088/1361-648X/ad2586
Abstrakt: Novel rare-earth silicide, Tb 2 Co 0.8 Si 3.2 compound, crystallizes in Lu 2 CoGa 3 structure, a distorted substitution variant of the AlB 2 structure. The compound exhibits a complex magnetic state, with a ferromagnetic transition at 58 K, followed by successive antiferromagnetic transitions at 24 K and 8 K, respectively. Isothermal and magnetic hysteresis studies indicate the prominence of competing antiferro and ferromagnetic interactions in the compound. However, this does not lead to the formation of spin glass behavior, as confirmed by AC magnetic susceptibility and heat capacity studies. In the paramagnetic state, the short-range ferromagnetic ordering of cobalt creates a Griffiths-like anomaly that is suppressed at higher magnetic fields. Investigation of magnetocaloric and magnetoresistance properties identifies the compound as a conventional second-order magnetocaloric material with negative magnetoresistance. Furthermore, the determination of Landau coefficients and subsequent analysis indicate that the isothermal entropy change of the compound can be calculated from these coefficients.
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Databáze: MEDLINE
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