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