Strain induced enhanced ferromagnetic behavior in inhomogeneous low doped La0.95Sr0.05MnO3+delta

• Autor(a) principal: Das, S.
• Data de Publicação: 2013
• Outros Autores: Amaral, J. S., De, K., Willinger, M., Goncalves, J. N., Roy, A., Dhak, P., Giri, S., Majumder, S., Silva, C. J. R., Gomes, M. J. M., Mahapatra, P. K., Amaral, V. S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/19216
• topic: GIANT MAGNETORESISTANCE; PHASE-TRANSITION; MANGANITES; LAMNO3; SIZE

We report an unusual high-temperature ferromagnetic transition in bulk single-phase nanocrystalline La0.95Sr0.05MnO3+delta, achieved through localized strain and inhomogeneous Sr-doping. Magnetization measurements show a well defined transition at 290K and a broad one at similar to 150 K. HRTEM imaging reveals the strain on the highly crystalline nanometer sized grains and Sr-doping gradients, while oxygen homogeneity at the grain interfaces is confirmed by EELS-spectra. The magnetic behavior, far from the expected bulk phase diagram, shows how local doping and strain can strongly tune the macroscopic properties of a bulk material. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793657]