Comparative analysis of magnetic and caloric determinations of the magnetocaloric effect in Mn0.99Co0.01As

Wang, G. ; Palacios, E. (Universidad de Zaragoza) ; Aguiar Coelho, A. ; Gama, S. ; Burriel, R. (Universidad de Zaragoza)

Resumen: The results from direct and indirect determinations of the magnetocaloric parameters of Mn0.99Co0.01As have been analyzed. The isothermal entropy change (Delta ST) due to external magnetic field changes has been determined through direct measurements of the heat absorbed by the sample when the field is removed under isothermal conditions. It has also been calculated from isothermal magnetization and isofield heat capacity measurements. In addition to that, the adiabatic temperature change (Delta TS) has been obtained from direct measurements and from isofield heat capacity measurements. The different results of both Delta ST and Delta TS are compared. Due to the presence of a first-order phase transition, the studied sample exhibits giant magnetocaloric effect at room temperature. The observed maximum values, -Delta ST,max = 32.1 J/kg·K and Delta TS,max = 17.7 K for a field change from 0 to 6 T, suggest that the Co-doped MnAs compounds are promising candidates for the preparation of useful materials for magnetic refrigeration near room temperature.

Idioma: Inglés

DOI: 10.1051/epjconf/20147504003

Año: 2014

Publicado en: EPJ web of conferences 75 (2014), 04003 [4 pp]
ISSN: 2101-6275

Financiación: info:eu-repo/grantAgreement/ES/MICINN/CSD2007-00010
Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2007-61621

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Física de la Materia Condensada (Departamento de Física de la Materia Condensada)