48376 20200221144148.0 doi 10.1103/PhysRevB.93.064420 sideral 94076 ART-2016-94076 eng (orcid)0000-0003-3567-7030 Palacios, E. Universidad de Zaragoza Effect of Gd polarization on the large magnetocaloric effect of GdCrO4 in a broad temperature range 2016 Access copy available to the general public Unrestricted The ferromagnetic zircon-type phase of GdCrO4 presents high values for the magnetocaloric (MC) parameters. This compound has large isothermal entropy changes ¿ST under the magnetic field action in a wide temperature range, from 5 to 35 K, reaching a maximum |¿ST|=29.0±0.1J/kgK at 22 K, for a field increment ¿B=9 T. It orders ferromagnetically at TC=21.3K via the Cr-Cr exchange interaction and shows a second transition at 4.8 K due to the ordering of the Gd sublattice. The large MC effect is enhanced by the polarization of the Gd3+ ions by the Cr5+ ones via a weaker Gd-Cr interaction. This effect is an interesting feature to be considered in the search for new compounds with a high MC effect in the range of liquid hydrogen or natural gas, regarding the liquefaction of gases by magnetization-demagnetization cycles. This paper contains experimental measurements of magnetization, heat capacity, and direct determinations of the MC effect. The magnetic contribution to the heat capacity Cm has been obtained after subtracting the lattice component. Approximate values for the exchange constants J1 (Cr-Cr) and J3 (Gd-Cr) have been deduced from Cm. info:eu-repo/grantAgreement/ES/MINECO/MAT2013-44063-R info:eu-repo/grantAgreement/ES/DGA/E100 info:eu-repo/semantics/openAccess by-nc http://creativecommons.org/licenses/by-nc/3.0/es/ 0.0 2016 Electronic, Optical and Magnetic Materials 2016 Condensed Matter Physics 2016 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Tomasi, C. Sáez-Puche, R. Dos Santos-García, A.J. Fernández-Martínez, F. (orcid)0000-0003-2962-9251 Burriel, R. Universidad de Zaragoza 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 93, 6 (2016), 064420 [8 pp] Phys. Rev. B Physical Review B 2469-9950 646444 http://zaguan.unizar.es/record/48376/files/texto_completo.pdf Versión publicada 134863 http://zaguan.unizar.es/record/48376/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:48376 articulos driver 2020-02-21-13:07:11 ARTICLE