| Texto completo | |
| Autor(es): |
Kaneko, U. F.
;
Gomes, P. F.
;
Garcia-Flores, A. F.
;
Yan, J. -Q.
;
Lograsso, T. A.
;
Barberis, G. E.
;
Vaknin, D.
;
Granado, E.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW B; v. 96, n. 1, p. 5-pg., 2017-07-10. |
| Resumo | |
Raman scattering experiments on LaFeAsO with distinct antiferromagnetic (T-AFM = 140 K) and tetragonal-orthorhombic (T-S = 155 K) transitions show a quasielastic peak (QEP) in B-2g symmetry (2 Fe tetragonal cell) that fades away below similar to T-AFM and is ascribed to electronic nematic fluctuations. A scaling of the reported shear modulus with the T dependence of the QEP height rather than the QEP area indicates that magnetic degrees of freedom drive the structural transition. The large separation between T-S and T-AFM in LaFeAsO compared to BaFe2As2 manifests itself in slower dynamics of nematic fluctuations in the former. (AU) | |
| Processo FAPESP: | 12/04870-7 - Estudos de novos materiais complexos e avançados |
| Beneficiário: | Pascoal Jose Giglio Pagliuso |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |