Magnetic field at Ce impurities in La sites of La0.5Ba0.5MnO3 double perovskites

Autor(es)

Bosch-Santos, B. ^[1] ; Nascimento, N. M. ^[1] ; Saiki, M. ^[1] ; Correa, E. L. ^[1] ; Sales, T. S. N. ^[1] ; Pereira, L. F. D. ^[1] ; Cabrera-Pasca, G. A. ^[2] ; Saxena, R. N. ^[1] ; Schell, J. ^{[3, 4, 5]} ; Carbonari, A. W. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo - Brazil

^[2] Univ Fed Para, Fac Ciencias Exatas & Tecnol, BR-68440000 Abaetetuba, PA - Brazil

^[3] European Org Nucl Res CERN, CH-1211 Geneva - Switzerland

^[4] Univ Duisburg Essen, Inst Mat Sci, D-45141 Essen - Germany

^[5] Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, D-45141 Essen - Germany

• Tipo de documento: Artigo Científico
• Fonte: AIP ADVANCES; v. 9, n. 3 MAR 2019.
• Citações Web of Science: 0

Resumo

Due to its rich variety of electromagnetic properties, such as a colossal magnetoresistance, charge and orbital ordering, and metal-insulator transition, the magnetic behavior in La0.5Ba0.5MnO3 double perovskite compounds has been investigated by several techniques, however more experimental data, especially from atomic resolution techniques, are still necessary to understand such complex behavior. In this paper, we have used a nuclear and short-range technique, the Perturbed Angular Correlation (PAC) spectroscopy, to investigate the magnetic hyperfine interaction at the Ce-140 and Cd-111 probe nuclei as impurities occupying La sites. This double perovskite samples were synthesized by Sol-Gel route. The crystal structure was determined by X-ray diffraction and the analyses showed that this method produced perovskite oxides with cubic structure in Pm-3m space group and the homogeneity was determined by Transmission Electron Microscopy (TEM). The local properties investigated by PAC spectroscopy revealed a ferromagnetic transition temperature above 300 K and a pure antiferromagnetic interaction below 100 K. Moreover, it also indicates an anomalous behavior of the temperature dependence of magnetic hyperfine field at La sites measured with Ce-140 probe nuclei, which can be ascribed to the contribution of 4f band of Ce to Magnetic Hyperfine Field (B-hf) at low temperatures due to the increase in its localized character. (C) 2019 Author(s). (AU)

• Processo FAPESP: 17/50332-0 - Capacitação científica, tecnológica e em infraestrutura em radiofármacos, radiações e empreendedorismo a serviço da saúde (PDIp)
• Beneficiário: Marcelo Linardi
• Modalidade de apoio: Auxílio à Pesquisa - Programa Modernização de Institutos Estaduais de Pesquisa