Abstract
The search for materials showing large caloric effects close to room temperature has become a challenge in modern materials physics and it is expected that such a class of materials will provide a way to renew present cooling devices that are based on the vapour compression of hazardous gases. Up to now, the most promising materials are giant magnetocaloric materials. The discovery of materials showing a giant magnetocaloric effect at temperatures close to ambient has opened up the possibility of using them for refrigeration1,2,3. As caloric effects refer to the isothermal entropy change achieved by application of an external field, several caloric effects can take place on tuning different external parameters such as pressure and electric field. Indeed the occurrence of large electrocaloric4,5 and elastocaloric6 effects has recently been reported. Here we show that the application of a moderate hydrostatic pressure to a magnetic shape-memory alloy gives rise to a caloric effect with a magnitude that is comparable to the giant magnetocaloric effect reported in this class of materials. We anticipate that similar barocaloric effects will occur in many giant-magnetocaloric materials undergoing magnetostructural transitions involving a volume change.
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Acknowledgements
This work was supported by CICyT (Spain), projects MAT2007-62100, and FIS2008-00837 and by Deutsche Forschungsgemeinschaft, grant No. SPP 1239. D.G. acknowledges support from DGICyT (Spain).
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L.M. and A.P. planned the experiments in collaboration with J.T. and M.A. Sample preparation and magnetization measurements were carried out by S.A. and M.A. Calorimetric measurements under pressure were carried out by E.B. and M.B., and under magnetic field, by D.G. All authors discussed the results and analysed the data. The manuscript was prepared by L.M. in collaboration with A.P., J.T. and M.A.
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Mañosa, L., González-Alonso, D., Planes, A. et al. Giant solid-state barocaloric effect in the Ni–Mn–In magnetic shape-memory alloy. Nature Mater 9, 478–481 (2010). https://doi.org/10.1038/nmat2731
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DOI: https://doi.org/10.1038/nmat2731
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