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Reversible and irreversible magnetocaloric effect: The cases of rare-earth intermetallics YbPt2Sn and Ce0.5La0.5B6

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Brando,  Manuel
Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Gruner, T., Kim, D., Brando, M., Dukhnenko, A. V., Shitsevalova, N. Y., Filipov, V. B., et al. (2019). Reversible and irreversible magnetocaloric effect: The cases of rare-earth intermetallics YbPt2Sn and Ce0.5La0.5B6. Journal of Magnetism and Magnetic Materials, 489: 165389, pp. 1-8. doi:10.1016/j.jmmm.2019.165389.


Cite as: http://hdl.handle.net/21.11116/0000-0003-D8A6-E
Abstract
Magnetocaloric effect (MCE) has drawn much attention because its magnetic cooling property enables refrigeration without producing noxious gas or using rapidly depleting resources. However, applications for everyday life are yet distant. In addition, we need to understand more about the practical aspect of the MCE. Here, we introduce a phenomenological model to explain the quasi-adiabatic MCE. Correction factors to the equilibrium thermodynamic feature implied by the entropy landscape are devised in analytic forms. To demonstrate the validity of the model, the MCE from two different materials is investigated. The recently discovered metallic paramagnet, YbPt2Sn, shows a linear and reversible MCE which is typical of a paramagnetic system and suitable for cryogenics without 3He. On the other hand, a complex-phase material, Ce0.5La0.5B6, exhibits a pronounced irreversible MCE especially across a magnetic phase boundary. A term that describes the field induced heating near a phase transition turns out to be essential in resolving the irreversible, non-equilibrium MCE. © 2019