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Magnetochemistry 2017, 3(4), 36; doi:10.3390/magnetochemistry3040036

Analysis of the Anisotropic Magnetocaloric Effect in RMn2O5 Single Crystals

1
Institut Quantique, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
2
Regroupement québécois sur les matériaux de pointe, Département de physique, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
3
Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada
4
Institute of Solid State Physics, Bulgarian Academy of Science, Sofia 1184, Bulgaria
5
Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
*
Author to whom correspondence should be addressed.
Received: 6 October 2017 / Revised: 30 October 2017 / Accepted: 8 November 2017 / Published: 21 November 2017
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Abstract

Thanks to the strong magnetic anisotropy shown by the multiferroic RMn2O5 (R = magnetic rare earth) compounds, a large adiabatic temperature change can be induced (around 10 K) by rotating them in constant magnetic fields instead of the standard magnetization-demagnetization method. Particularly, the TbMn2O5 single crystal reveals a giant rotating magnetocaloric effect (RMCE) under relatively low constant magnetic fields reachable by permanent magnets. On the other hand, the nature of R3+ ions strongly affects their RMCEs. For example, the maximum rotating adiabatic temperature change exhibited by TbMn2O5 is more than five times larger than that presented by HoMn2O5 in a constant magnetic field of 2 T. In this paper, we mainly focus on the physics behind the RMCE shown by RMn2O5 multiferroics. We particularly demonstrate that the rare earth size could play a crucial role in determining the magnetic order, and accordingly, the rotating magnetocaloric properties of RMn2O5 compounds through the modulation of exchange interactions via lattice distortions. This is a scenario that seems to be supported by Raman scattering measurements. View Full-Text
Keywords: RMn2O5; multiferroics; anisotropy; single crystals; magnetocaloric effect; Raman scattering RMn2O5; multiferroics; anisotropy; single crystals; magnetocaloric effect; Raman scattering
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Balli, M.; Mansouri, S.; Jandl, S.; Fournier, P.; Dimitrov, D.Z. Analysis of the Anisotropic Magnetocaloric Effect in RMn2O5 Single Crystals. Magnetochemistry 2017, 3, 36.

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