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, TC. For example, in the LaEuSrMnO3 system TC drops from 360 to 308K 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 TC'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.
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