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

• Type: Article in International Scientific Journal
• Date: 2005

Authors

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

Journal

Title: Journal of Magnetism and Magnetic Materials

Vol. 290

Pages: 686-689

ISSN: 0304-8853

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 200 Citations

Scopus - 193 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4