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Thermal annealing effects on the magnetic behavior of Ce2NiSi3

Abstract: We have investigated the crystallographic, magnetic and thermodynamic properties of the as-cast and annealed Ce2NiSi3 alloys, crystallizing in the AlB2-type hexagonal structure. The DC-magnetic susceptibility data show that the as-cast sample exhibits an antiferromagnetic (AFM) ordering below TN¼ 3.8 K, whereas the annealed sample shows, at 4.2 K, a magnetic transition of AFM nature and, around 2.5 K, an additional anomaly. The specific heat shows a peak with cmax ¼ 7:4 J=mol K at 3.8 K for the as cast sample, which shifts to lower temperatures when the magnetic field increases, consistent with the antiferromagnetic nature of the transition. On the other hand, in the annealed alloy, the maximum of the specific heat peak reaches 9:3 J=mol K at 4.2 K, and no additional anomalies were observed. The different magnetic behavior between the as-cast and annealed samples is attributed to thermal effects on the structural disorder of nickel and silicon atoms, as already observed in other isotypic R2TSi3 alloys, where R¼U or Ce, and T¼ transition metal.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Rojas D.P., Rodrguez Fernndez J., Espeso J.I., Gmez Sal J.C., Da Silva L.M., Gandra F.G., Dos Santos A.O., Medina A.N.,

 Fuente: Journal of Magnetism and Magnetic Materials, 2010, 322(20), 3192-3195

Editorial: Elsevier

 Año de publicación: 2010

Nº de páginas: 4

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.jmmm.2010.05.059

ISSN: 0304-8853,1873-4766

 Proyecto español: MAT 2008-06542-c04-04

Url de la publicación: https://doi.org/10.1016/j.jmmm.2010.05.059

Autoría

DA SILVA, L. M.

GANDRA, F. G.

DOS SANTOS. A. O.

MEDINA, A.N.