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

• Authors: A. Sazanovich , J. Pietosa , A. Pashchenko , E. Zubov , V. Dyakonov , H. Szymczak
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

75.30.Sg; 61.50.Nw; 65.40.gd

Discipline

• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)
• 65.40.gd: Entropy
• 61.50.Nw: Crystal stoichiometry

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 1
• Pages: 162-166

Dates

published

2012-07

received

2011-06-20

(unknown)

2012-02-15

Contributors

author

A. Sazanovich

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

J. Pietosa

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

A. Pashchenko

• A.A. Galkin Donetsk Physico-Technical Institute, NANU, R. Luxembourg 72, 83114 Donetsk, Ukraine

author

E. Zubov

• A.A. Galkin Donetsk Physico-Technical Institute, NANU, R. Luxembourg 72, 83114 Donetsk, Ukraine

author

V. Dyakonov

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
• A.A. Galkin Donetsk Physico-Technical Institute, NANU, R. Luxembourg 72, 83114 Donetsk, Ukraine

author

H. Szymczak

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.122.162