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.

• 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