Magnetocaloric effect in Er- and Eu-substituted ferromagnetic La-Sr manganites

• Tipo: Artigo em Revista Científica Internacional
• Data: 2005

Autores

Amaral, J. S. (Autor) Outra; Reis, Mário Souza (Autor) Outra; Amaral, V. S. (Autor) Outra; Mendonça, Tânia Melo (Autor) Outra; Araújo, João Pedro (Autor) FCUP; Sá, M. A. (Autor) Outra; Tavares, Pedro B. (Autor) Outra; Vieira, Joaquim Manuel (Autor) Outra

Revista

Título: Journal of Magnetism and Magnetic Materials

Vol. 290

Páginas: 686-689

ISSN: 0304-8853

Editora: Elsevier

Indexação

ISI Web of Knowledge - 200 Citações

Scopus - 193 Citações

Outras Informações

ID Authenticus: P-000-426

DOI: 10.1016/j.jmmm.2004.11.337

Abstract (EN): We have studied the magnetocaloric effect in La0.7Sr0.3MnO3 colossal magnetoresistive manganites, where La is substituted by Er or Eu. The addition of these rare-earth ions allows a tunable decrease in the Curie temperature, T-C. For example, in the LaEuSrMnO3 system T-C drops from 360 to 308 K for 0.14% of Eu substitution. We find quite large values of magnetic entropy change. For an applied magnetic field of 1 T, the maximum values for both studied systems are close to that of the parent La0.7Sr0.3MnO3, near their respective T-C's. Relative cooling power value increases notably for higher concentrations of Eu, in contrast to the Er-substituted samples. These results are discussed in terms of magnetoelastic and electron interaction contribution to the magnetic entropy.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4