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Charge-Ordering and Magnetoelastic Coupling Effects on the Magnetocaloric Properties of Manganites

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Reis M., Gomes A., Araújo J., Tavares P., Amaral J., Oliveira I., Amaral V.

Acta Physica Polonica A

2004

vol. 105

issue 1-2

163-171

A study of the magnetocaloric properties of La_{1-x-y}Y_yCa_xMnO_3, La_{1-x}Cd_xMnO_3, and Pr_{1-x}Ca_xMnO_3 manganites with ferromagnetic and charge-ordered states is presented. The ferromagnetic lanthanum manganites show a negative entropy change peakΔ S under the application of a magnetic field at the Curie temperature. However, the magnetoelastic coupling effects lead to a first-order paramagnetic-ferromagn etic transition and an increasedΔ S compared to simple ferromagnets. This effect is analyzed in the framework of the Landau theory of phase transitions which shows a comparable influence of the magnetoelastic couplings and the ordinary magnetic ordering effect. The Pr_{1-x}Ca_xMnO _3 system shows a rich electric and magnetic phase diagram, with a ferromagnetic insulator phase for 0.15

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1 Acta Physica Polonica A

1 2004

1 Amaral J.

1 Amaral V.

1 Araújo J.

1 Gomes A.

1 Oliveira I.

1 Reis M.

1 Tavares P.

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Charge-Ordering and Magnetoelastic Coupling Effects on the Magnetocaloric Properties of Manganites