| Texto completo | |
| Autor(es): |
Ramon, J. G. A.
;
Wang, C. W.
;
Ishida, L.
;
Bernardo, P. L.
;
Leite, M. M.
;
Vichi, F. M.
;
Gardner, J. S.
;
Freitas, R. S.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW B; v. 99, n. 21, p. 7-pg., 2019-06-27. |
| Resumo | |
Neutron scattering, ac magnetic susceptibility, and specific-heat studies have been carried out on polycrystalline Dy2Zr2O7. Unlike the pyrochlore spin ice Dy2Ti2O7, Dy2Zr2O7 crystallizes into the fluorite structure and the magnetic Dy3+ moments randomly reside on the corner-sharing tetrahedral sublattice with nonmagnetic Zr ions. Antiferromagnetic spin correlations develop below 10 K but remain dynamic down to 40 mK, with a significant amount of magnetic susceptibility. These correlations extend over the length of two tetrahedra edges and grow to six nearest neighbors with the application of a 20-kOe magnetic field. Magnetic heat capacity revealed a correlation peak at 2 K, but no Pauling's residual entropy was observed. We propose that the disorder precludes the development of spin-ice correlations seen in the chemically ordered Dy2Ti2O7 compound, with fluctuating spins in a disordered, liquidlike state (albeit slow) which do not freeze into a canonical spin-glass state that one might intuitively expect. (AU) | |
| Processo FAPESP: | 11/19941-4 - Nanoestruturas de silicatos com propriedades luminescentes obtidos através de rotas de síntese não convencionais |
| Beneficiário: | Flávio Maron Vichi |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 15/16191-5 - Pesquisas em novos materiais envolvendo campos magnéticos intensos e baixas temperaturas |
| Beneficiário: | Gennady Gusev |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |