Effect of the magnetic impurity on the charge diffusion in highly dilute Ce doped LaMnO3
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2019
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ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 64th
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Resumo
LaMnO3+δ is a complex oxide, which, depending on the oxygen excess concentration δ, presents different crystalline structure and interesting
magnetic and electric properties such as colossal magnetoresistance, polaron dynamics, multiferroic behavior, and charge-orbital ordering. This
complexity requires different characterization techniques to draw a picture
as complete as possible allowing a good understanding of these phenomena.
Here, we have used the perturbed angular correlation (PAC) technique to
measure hyperfine interactions at La and Mn sites of LaMnO3+δ (δ ~0.15)
using 140Ce (at La sites) and 111Cd (at both La and Mn sites) as probe nuclei
in order to investigate within an atomic scale the magnetic and electric interactions in this compound. Results show that 111Cd nuclei occupy quite
high symmetric local sites in agreement with a rhombohedral structure. The
magnetic hyperfine field (Bhf) measured with 111Cd at La sites is very small
(Bhf = 0.40 T) due to the supertransferred magnetic field from Mn neighbors
through oxygen orbitals. On the other hand, 140Ce nuclei at La sites present a
saturation field of around 3.7 T much higher than that expected for La sites
(due to the weak transfer field by superexchange mechanism). In addition,
for temperature range above the magnetic ordering (200-300 K) a dynamic
hyperfine interaction was observed characterized by the attenuation parameter λ(T) whose temperature dependence allowed to determine the activation
energy (Ea) associated to the polaron diffusion, as displayed in Fig. 1.
Como referenciar
CABRERA-PASCA, G.; BOSCH-SANTOS, B.; BURIMOVA, A.; CORREA, E.; CARBONARI, A.W. Effect of the magnetic impurity on the charge diffusion in highly dilute Ce doped LaMnO3. In: ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 64th, November 4-8, 2019, Las Vegas, Nevada, USA. Abstract... p. 207-207. Disponível em: http://repositorio.ipen.br/handle/123456789/31533. Acesso em: 30 Dec 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.