Magnetic field at Ce impurities in La sites of LaBaMn2O6 double perovskites
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2019
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JOINT MMM-INTERMAG CONFERENCE
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Magnetic behavior in LaBaMn2O6 double perovskite compounds has been
investigated with various techniques, due to the rich variety of electromagnetic properties, such as a colossal magnetoresistance, charge and orbital ordering, and metal-insulator transition. In this paper, we have used a nuclear
and short-range technique, the Perturbed Angular Correlation (PAC) spectroscopy,
to investigate the magnetic hyperfine field at the 140Ce nucleus
of Ce impurities occupying La sites. The radioactive 140La nuclei with a
half-life of 40.8 h were produced by direct activation of natural La present
in the samples through the irradiation with neutrons in the IEA-R1 nuclear
research reactor of IPEN. The PAC measurements were carried out with a
six BaF2 detector spectrometer at several temperatures between 10 K and
400 K. 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. This phase occurs due to an oxygen deficiency. The
local properties investigated by PAC spectroscopy revealed a ferromagnetic
transition temperature above 300 K and an anomalous behavior of the
temperature dependence of magnetic hyperfine field at La sites, which can
be ascribed to the contribution of 4f band of Ce to Bhf at low temperatures
due to the increase in its localized character.
Como referenciar
BOSCH-SANTOS, B.; NASCIMENTO, N.; SAIKI, M.; CORREA, E.L.; SALES, T.S.; PEREIRA, L.F.; CABRERA-PASCA, G.A.; CARBONARI, A.W. Magnetic field at Ce impurities in La sites of LaBaMn2O6 double perovskites. In: JOINT MMM-INTERMAG CONFERENCE, January 14-18, 2019, Washington, DC, USA. Abstract... Melville, NY, USA; Piscataway, NJ, USA: AIP Publishing; IEEE Magnetics, 2019. p. 759-760. Disponível em: http://repositorio.ipen.br/handle/123456789/30975. Acesso em: 28 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.