Magnetic interactions at Ce impurities in REMn2Ge2 (RE = La, Ce, Pr, Nd) compounds

Autor(es)

Bosch-Santos, B. ^[1] ; Cabrera-Pasca, G. A. ^[2] ; Saxena, R. N. ^[1] ; Burimova, A. N. ^[1] ; Carbonari, A. W. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, CNEN SP, IPEN, Sao Paulo - Brazil

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

• Tipo de documento: Artigo Científico
• Fonte: PHYSICA B-CONDENSED MATTER; v. 536, p. 137-141, MAY 1 2018.
• Citações Web of Science: 0

Resumo

In the work reported in this paper, the temperature dependence of the magnetic hyperfine field (B(h)f) at Ce-140 nuclei replacing Pr atoms in PrMn2Ge2 compound was measured by the perturbed angular correlation technique to complete the sequence of measurements in REMn2Ge2 (RE = La, Ce, Pr, Nd). Results show an anomalous behavior different from the expected Brillouin curve. A model was used to fit the data showing that the Ce impurity contribution (B-hf(imp)) to B-hf is negative for NdMn2Ge2 below 210 K. The impurity contribution ( B-hf(imp)) at 0 K for all compounds is much smaller than that for the free Ce3+, showing that the 4f band of Ce is more likely highly hybridized with 5d band of the host. Results show that direction of the localized magnetic moment at Mn atoms strongly affects the exchange interaction at Ce impurities. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 14/14001-1 - Projeto e construção de um espectrômetro digital: um equipamento mais eficiente e moderno para investigação de materiais utilizando técnica PAC
• Beneficiário: Rajendra Narain Saxena
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/11104-9 - Investigação em escala atômica de óxidos metálicos nano-estruturados semicondutores de alta constante dielétrica por uma técnica nuclear
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• Linha de fomento: Auxílio à Pesquisa - Regular