Spontaneous magnetization above T-C in polycrystalline La0.7Ca0.3MnO3 and La0.7Ba0.3MnO3

• Autor(a) principal: Turcaud, J. A.
• Data de Publicação: 2014
• Outros Autores: Pereira, A. M., Sandeman, K. G., Amaral, J. S., Morrison, K., Berenov, A., Daoud-Aladine, A., Cohen, L. F.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/20145
• topic: DOUBLE EXCHANGE; MANGANITES; PEROVSKITE; BEHAVIOR; PHASE; DISORDER; POINT; FIELD

In the present work, spontaneous magnetization is observed in the inverse magnetic susceptibility of La0.7Ca0.3MnO3 and La0.7Ba0.3MnO3 compounds above T-C up to a temperature T*. From information gathered from neutron diffraction, dilatometry, and high-field magnetization data, we suggest that T* is related to the transition temperature of the low-temperature (high magnetic field) magnetic phase. In the temperature region between T* and T-C, the application of a magnetic field drives the system from the high-temperature to low-temperature magnetic phases, the latter possessing a higher magnetization.