Enhanced magnetocaloric effect by the rare earth polarization due to the exchange with a transition metal. Study of GdCrO4

Palacios, Elías (Universidad de Zaragoza) ; Tomasi, Corrado ; Saez-Puche, Regino ; Dos Santos-Garcia, Antonio J. ; Fernandez-Martinez, Francisco ; Burriel, Ramón (Universidad de Zaragoza)

Resumen: The zircon polymorph of GdCrO4 has a large magnetocaloric effect over a wide temperature range, with |¿ST| > 20 J/kg·K from 6 K to 34 K, for a magnetic field of 9 T. This unusual behaviour is very interesting on magnetic refrigeration applications, for liquefying H2 or natural gas. The mean-field approach explains that it is due to the weaker Gd-Cr magnetic exchange relative to the Cr-Cr one, while the Gd-Gd exchange is negligible. This possibility has not been sufficiently studied and opens an interesting strategy to design more efficient materials for magnetic refrigeration.

Idioma: Inglés

DOI: 10.4028/www.scientific.net/SSP.257.139

Año: 2017

Publicado en: SOLID STATE PHENOMENA 257 (2017), 139-142 [4 pp.]
ISSN: 1012-0394

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)