| Texto completo | |
| Autor(es): |
Lora-Serrano, R.
;
Garcia, D. J.
;
Betancourth, D.
;
Amaral, R. P.
;
Camilo, N. S.
;
Estevez-Rams, E.
;
Ortellado G Z, L. A.
;
Pagliuso, P. G.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Magnetism and Magnetic Materials; v. 405, p. 7-pg., 2016-05-01. |
| Resumo | |
We report the structural and magnetic characterization of La-substituted Gd(1-x)LaxRhIn(5) (x < 0.50) anti ferromagnetic (AFM) compounds. The magnetic responses of pure GdRhIn5 are well described by a S=7/ 2 Heisenberg model. When Gd3+ ions are substituted by Lai-', the maximum of the susceptibility and the inflection point of the magnetic specific heat are systematically shifted to lower temperatures accompanied by a broadening of the transition. The data is qualitatively explained by a phenomenological model which incorporates a distribution of magnetic regions with different transition temperatures (TN). The universal behaviour of the low temperature specific heat is found for La (vacancies) concentrations below x=0.40 which is consistent with spin wave excitations. For x=0.5 this universal behaviour is lost. The sharp second order transition of GdRhIn5 is destroyed, as seen in the specific heat data, contrary to what is expected for a Heisenberg model. The results are discussed in the context of the magnetic behaviour observed for the La -substituted (Ce,Tb,Nd)Rhln(5) compounds. (C) 2015 Elsevier B.V. All rights reserved. (AU) | |
| Processo FAPESP: | 06/50511-8 - Estudo de prpriedades e estruturas magneticas de novos compostos intermetalicos derivados da familia rmmnln3m+2n (r=terra-terra-rara; m=rh,ir ou co, m=1,2 e n=0,1). |
| Beneficiário: | Raimundo Lora Serrano |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 12/04870-7 - Estudos de novos materiais complexos e avançados |
| Beneficiário: | Pascoal Jose Giglio Pagliuso |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |