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Journal Article

Heat flux measurements of Tb3M series (M = Co, Rh and Ru): Specific heat and magnetocaloric properties


dos Reis,  R. D.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Monteiro, J. C. B., Lombardi, G. A., dos Reis, R. D., Freitas, H. E., Cardoso, L. P., Mansanares, A. M., et al. (2016). Heat flux measurements of Tb3M series (M = Co, Rh and Ru): Specific heat and magnetocaloric properties. Physica B-Condensed Matter, 503, 64-69. doi:10.1016/j.physb.2016.09.007.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-0ADF-E
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.