Effect of Gd polarization on the large magnetocaloric effect of GdCrO4 in a broad temperature range
Palacios, E. (Universidad de Zaragoza) ; Tomasi, C. ; Sáez-Puche, R. ; Dos Santos-García, A.J. ; Fernández-Martínez, F. ; Burriel, R. (Universidad de Zaragoza)
Resumen: 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.
Idioma: Inglés
DOI: 10.1103/PhysRevB.93.064420
Año: 2016
Publicado en: Physical Review B 93, 6 (2016), 064420 [8 pp]
ISSN: 2469-9950
Factor impacto SCIMAGO: 0.0 - Electronic, Optical and Magnetic Materials - Condensed Matter Physics
Financiación: info:eu-repo/grantAgreement/ES/DGA/E100
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2013-44063-R
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes.
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Idioma: Inglés
DOI: 10.1103/PhysRevB.93.064420
Año: 2016
Publicado en: Physical Review B 93, 6 (2016), 064420 [8 pp]
ISSN: 2469-9950
Factor impacto SCIMAGO: 0.0 - Electronic, Optical and Magnetic Materials - Condensed Matter Physics
Financiación: info:eu-repo/grantAgreement/ES/DGA/E100
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2013-44063-R
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. Exportado de SIDERAL (2020-02-21-13:07:11)
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Record created 2016-04-08, last modified 2020-02-21