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Influence of Nonstoichiometry on Magnetocaloric Effect in (La_{0.7}Ca_{0.3})_{1 - x}Mn_{1+x}O_3

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Sazanovich A., Pietosa J., Pashchenko A., Zubov E., Dyakonov V., Szymczak H.

Acta Physica Polonica A

2012

vol. 122

issue 1

162-166

Magnetocaloric effect in (La_{0.7}Ca_{0.3})_{1 - x}Mn_{1 + x}O_3 manganites with x = 0, 0.1, 0.2 has been investigated. It is found a strong influence of nonstoichiometry caused by excessive manganese on the magnetic entropy change. The magnetocaloric effect was evaluated from the isothermal curves of spontaneous magnetization versus the applied magnetic field by using the well-known thermodynamical Maxwell relation. The maximum entropy value, | Δ S_{M}^{max} |, near the ferromagnetic-paramagnetic phase transition is shown to increase with the manganese content. The La_{0.56}Ca_{0.24}Mn_{1.2}O_3 manganite exhibits the largest | Δ S_{M}^{max} | value equal to 3.09 J kg^{-1} K^{-1} at 15 kOe near T_{C} = 267 K. The magnetocaloric effect values obtained allow to propose that the studied manganites are promising materials for future cooling application.

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1 Acta Physica Polonica A

1 2012

1 Dyakonov V.

1 Pashchenko A.

1 Pietosa J.

1 Sazanovich A.

1 Szymczak H.

1 Zubov E.

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Influence of Nonstoichiometry on Magnetocaloric Effect in (La_{0.7}Ca_{0.3})_{1 - x}Mn_{1+x}O_3