| Texto completo | |
| Autor(es): |
de Abrantes, Juliana G.
;
Cantarino, Marli R.
;
da Silva Neto, Wagner R.
;
Freire, Victoria V.
;
Figueiredo, Alvaro G.
;
Germano, Tarsis M.
;
Mounssef, Bassim, Jr.
;
Bittar, Eduardo M.
;
Leithe-Jasper, Andreas
;
Garcia, Fernando A.
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW MATERIALS; v. 6, n. 8, p. 10-pg., 2022-08-16. |
| Resumo | |
Vibrational and elastic properties of the RFe4Sb12 skutterudites are investigated by, respectively, temperature (T) dependent extended x-ray absorption fine structure (EXAFS) and pressure (P) dependent x-ray diffraction (XRD) experiments. The Fe K-edge EXAFS experiments of the R = K, Ca, and Ba materials were performed in the T interval 6 < T < 300K and XRD experiments of the R = Na, K, Ca, Sr, and Ba materials were performed in the P interval 1 atm < P < 16 GPa. From EXAFS, we obtained the correlated Debye-Waller parameters that were thus analyzed to extract effective spring constants connected with the Fe-Y (where Y = either R, Fe or Sb) scattering paths. Our findings suggest that in the case of the light cations, R = K or Ca, the R atoms are relatively weakly coupled to the cage, in a scenario reminiscent to the Einstein oscillators. From the XRD experiments, we obtained the bulk modulus B0 for all R = Na, K, Ca, Sr, and Ba materials, with values ranging from 77 GPa (R = K) to R = 99 GPa (R = Ba) as well as the compressibility ss as a function of P. The trend in ss as a function of the R filler is discussed and it is shown that it does not correlate with simple geometrical considerations but rather with the filler-cage bonding properties. (AU) | |
| Processo FAPESP: | 19/05150-7 - Estrutura eletrônica e excitações magnéticas de supercondutores magnéticos |
| Beneficiário: | Marli dos Reis Cantarino |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 20/13701-0 - Estudo da estrutura eletrônica em supercondutores baseados em ferro usando ARPES |
| Beneficiário: | Marli dos Reis Cantarino |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 19/25665-1 - Instabilidades de carga e spin em supercondutores não convencionais |
| Beneficiário: | Fernando Assis Garcia |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |