Critical behavior and magnetic entropy change in La sub(0.7)Ca sub(0.3)Mn sub(0.9)Zn sub(0.1)O sub(3) perovskite manganite

We studied the critical behavior and magnetic entropy change in a perovskite-manganite compound of La sub(0.7)Ca sub(0.3)Mn sub(0.9)Zn sub(0.1)O sub(3) around its Curie temperature of T sub(C) = 206.75 K. Experimental results revealed that the sample exhibited the second-order magnetic phase transit...

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Bibliographic Details
Published in:Current applied physics 2011-05, Vol.11 (3), p.830-833
Main Authors: Phan, T L, Thanh, P Q, Sinh, N H, Lee, K W, Yu, S C
Format: Article
Language:English
Subjects:
Beta
Curie temperature
Entropy
Exponents
Manganites
Parents
Perovskites
Phase transformations
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Summary:We studied the critical behavior and magnetic entropy change in a perovskite-manganite compound of La sub(0.7)Ca sub(0.3)Mn sub(0.9)Zn sub(0.1)O sub(3) around its Curie temperature of T sub(C) = 206.75 K. Experimental results revealed that the sample exhibited the second-order magnetic phase transition with the exponents beta = 0.474 and gamma = 1.152 close to those expected from the mean-field theory ( beta = 0.5 and gamma = 1.0). In the vicinity of T sub(C), the magnetic entropy change delta S sub(M) reached maximum values of 1.1, 1.7, and 2.7 J/kg K under magnetic-field variations of 10, 20, and 35 kOe, respectively. These delta S sub(M) values are much lower than those reported previously on the parent compound of La sub(0.7)Ca sub(0.3)MnO sub(3). The nature of this phenomenon is discussed by means of the characteristics of the magnetic phase transition, and critical exponents.
ISSN:1567-1739
DOI:10.1016/j.cap.2010.12.002