authors |
Amaral, JS; Reis, MS; Amaral, VS; Mendonca, TM; Araujo, JP; Sa, MA; Tavares, PB; Vieira, JM |
nationality |
International |
journal |
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS |
author keywords |
magnetic entropy change; manganite; magnetic cooling |
abstract |
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. (c) 2004 Elsevier B.V. All rights reserved. |
publisher |
ELSEVIER SCIENCE BV |
issn |
0304-8853 |
year published |
2005 |
volume |
290 |
beginning page |
686 |
ending page |
689 |
digital object identifier (doi) |
10.1016/j.jmmm.2004.11.337 |
web of science category |
Materials Science, Multidisciplinary; Physics, Condensed Matter |
subject category |
Materials Science; Physics |
unique article identifier |
WOS:000228837600173
|