Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/330208
Type: Artigo
Title: Heat Flux Measurements Of Tb3m Series (m = Co, Rh And Ru): Specific Heat And Magnetocaloric Properties
Heat flux measurements of Tb3M series (M = Co, Rh and Ru): specific heat and magnetocaloric properties
Author: Monteiro, J. C. B.
Lombardi, G. A.
Reis, R. D. dos
Freitas, H. E.
Cardoso, L. P.
Mansanares, A. M.
Gandra, F. G.
Abstract: We report on the magnetic properties and magnetocaloric effect (MCE) for the Tb3M series, with M = Co, Rh and Ru, obtained using a heat flux technique. The specific heat of Tb3Co and Tb3Rh are very similar, with a first order type transition occurring around 6 K below the magnetic ordering temperature without any corresponding feature on the magnetization. The slightly enhanced electronic specific heat, the Debye temperature around 150 K and the presence of the magnetic specific heat well above the ordering temperature are also characteristic of many other compounds of the R3M family (R = Rare Earth). The specific heat for Tb3Ru, however, presents two peaks at 37 K and 74 K. The magnetization shows that below the first peak the system presents an antiferromagnetic behavior and is paramagnetic above 74 K. We obtained a magnetocaloric effect for M= Co and Rh, -Delta S=12 J/kg K, but for Tb3Ru it is less than 3 J/kg K (mu(0)Delta H = 5 T). We believe that the experimental results show that the MCE is directly related with the process of hybridization of the (R)5d-(M)d electrons that occurs in the R3M materials. (C) 2016 Elsevier B.V. All rights reserved.
We report on the magnetic properties and magnetocaloric effect (MCE) for the Tb3M series, with M = Co, Rh and Ru, obtained using a heat flux technique. The specific heat of Tb3Co and Tb3Rh are very similar, with a first order type transition occurring around 6 K below the magnetic ordering temperature without any corresponding feature on the magnetization. The slightly enhanced electronic specific heat, the Debye temperature around 150 K and the presence of the magnetic specific heat well above the ordering temperature are also characteristic of many other compounds of the R3M family (R = Rare Earth). The specific heat for Tb3Ru, however, presents two peaks at 37 K and 74 K. The magnetization shows that below the first peak the system presents an antiferromagnetic behavior and is paramagnetic above 74 K. We obtained a magnetocaloric effect for M= Co and Rh, -Delta S=12 J/kg K, but for Tb3Ru it is less than 3 J/kg K (mu(0)Delta H = 5 T). We believe that the experimental results show that the MCE is directly related with the process of hybridization of the (R)5d-(M)d electrons that occurs in the R3M materials.
Subject: Specific Heat
Magnetocaloric Effect
Heat Flux Technique
Rare Earth Compounds
Canted Magnetic Structure
Calor específico, Efeito magnetocalórico, Compostos de metais de terras raras
Country: Holanda
Editor: Elsevier
Citation: Physica B: Condensed Matter. Elsevier Science Bv, v. 503, p. 64 - 69, 2016.
Rights: fechado
Identifier DOI: 10.1016/j.physb.2016.09.007
Address: https://www.sciencedirect.com/science/article/pii/S092145261630415X
Date Issue: 2016
Appears in Collections:IFGW - Artigos e Outros Documentos

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