| Texto completo | |
| Autor(es): |
Mercena, S. G.
[1]
;
Silva, L. S.
[2]
;
Lora-Serrano, R.
[3]
;
Garcia, D. J.
[4, 5]
;
Souza, J. C.
[6]
;
Pagliuso, P. G.
[6]
;
Duque, J. G. s
[1]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Fed Sergipe, Programa Posgrad Fis, Campus Prof Jose Aluisio Campos, BR-49100000 Sao Cristovao, SE - Brazil
[2] Inst Fed Tocantins IFTO, Campus Colinas Tocantins, BR-77760000 Colinas Do Tocantins, TO - Brazil
[3] Univ Fed Uberlandia, Inst Fis, BR-38408100 Uberlandia, MG - Brazil
[4] Ctr Atom Bariloche, San Carlos De Bariloche, Rio Negro - Argentina
[5] Consejo Nacl Invest Cient & Tecn CONICET, San Carlos De Bariloche, Rio Negro - Argentina
[6] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | INTERMETALLICS; v. 130, MAR 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
In this work, structural and magnetic properties RE Cu4Al8 (RE = Tb, Dy, Ho and Er) family of compounds are reported. Measurements of X-ray diffraction, temperature (T) and magnetic field (H) dependencies of magnetization are presented for each compound. The analysis of X-ray diffraction patterns shows a small variation in a (8.705824-8.734991 angstrom) and c (5.123802-5.135258 angstrom) lattice parameters as a function of the rare earth. The T-dependent magnetic susceptibility reveals the Curie-Weiss-like behavior at high-T evolving to antiferromagnetic transitions at low-T (6 < T-N < 28 K) for all studied materials. Measurements of magnetization as a function of magnetic field show field-induced transitions for RE = Dy, Ho and Er, which present larger magnetic moments, though no magnetic saturation is attained (4.4 < M-max < 7.3 mu B) for none of the studied compounds. This fact is an indicative of strong crystalline electrical field (CEF) effects. We have conducted a detailed analysis, based on a mean-field spin model, in order to determine the CEF parameters from the macroscopic data of the studied powdered samples. Finally, to show the reliability of our calculations, the obtained CEF energy levels and wave functions are compared with previous CEF studies in single crystalline samples of ErCu4Al8, including results obtained from inelastic neutron scattering data. (AU) | |
| Processo FAPESP: | 17/10581-1 - Fenômenos emergentes em sistemas de dimensões reduzidas |
| Beneficiário: | Pascoal Jose Giglio Pagliuso |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |
| Processo FAPESP: | 18/11364-7 - Propriedades magnéticas de sistemas complexos com topologia não-trivial |
| Beneficiário: | Jean Carlo Souza |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |