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Abstract:
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We studied the critical behavior and magnetic entropy change in a perovskite-manganite compound of
La0.7Ca0.3Mn0.9Zn0.1O3 around its Curie temperature of TC ¼ 206.75 K. Experimental results revealed that
the sample exhibited the second-order magnetic phase transition with the exponents b ¼ 0.474 and
g ¼ 1.152 close to those expected from the mean-field theory (b ¼ 0.5 and g ¼ 1.0). In the vicinity of TC,
the magnetic entropy change DSM reached maximum values of 1.1, 1.7, and 2.7 J/kg K under magneticfield
variations of 10, 20, and 35 kOe, respectively. These DSM values are much lower than those reported
previously on the parent compound of La0.7Ca0.3MnO3. The nature of this phenomenon is discussed by
means of the characteristics of the magnetic phase transition, and critical exponents. |