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