Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/324217
Type: Artigo
Title: Heat Flux Measurements Of Tb3m Series (m=co, Rh And Ru): Specific Heat And Magnetocaloric Properties
Author: Monteiro J.C.B.
Lombardi G.A.
dos Reis R.D.
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, −∆S=12 J/kg K, but for Tb3Ru it is less than 3 J/kg K (μ0∆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. © 2016 Elsevier B.V.
Subject: Canted Magnetic Structure
Heat Flux Technique
Magnetocaloric Effect
Rare Earth Compounds
Specific Heat
Editor: Elsevier
Rights: fechado
Identifier DOI: 10.1016/j.physb.2016.09.007
Address: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84988470741&doi=10.1016%2fj.physb.2016.09.007&partnerID=40&md5=a53acb2c4415e1181a4eda87cf09d65c
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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