Magnetic field at Ce impurities in La sites of La0.5Ba0.5MnO3 double perovskites
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2019
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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 140Ce and 111Cd 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 140Ce probe nuclei, which can be ascribed to the contribution of 4f band of Ce to Magnetic Hyperfine Field (Bhf) at low
temperatures due to the increase in its localized character.
Como referenciar
BOSCH-SANTOS, B.; NASCIMENTO, N.M.; SAIKI, M.; CORREA, E.L.; SALES, T.S.N.; PEREIRA, L.F.D.; CABRERA-PASCA, G.A.; SAXENA, R.N.; SCHELL, J.; CARBONARI, A.W. Magnetic field at Ce impurities in La sites of La0.5Ba0.5MnO3 double perovskites. AIP Advances, v. 9, n. 3, p. 035245-1 - 035245-5, 2019. DOI: 10.1063/1.5080094. Disponível em: http://repositorio.ipen.br/handle/123456789/30446. Acesso em: 28 Feb 2025.
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