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

Analysis of the Anisotropic Magnetocaloric Effect in RMn2O5 Single Crystals

Institut Quantique, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
Regroupement québécois sur les matériaux de pointe, Département de physique, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada
Institute of Solid State Physics, Bulgarian Academy of Science, Sofia 1184, Bulgaria
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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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

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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