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2004 | 105 | 1-2 | 163-171
Article title

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

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EN
Abstracts
EN
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
Keywords
EN
Contributors
author
  • Departamento de Fìsica and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal
  • Centro Brasileiro de Pesquisas Fìsicas, R. Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro-RJ, Brasil
author
  • Centro Brasileiro de Pesquisas Fìsicas, R. Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro-RJ, Brasil
author
  • Departamento de Fìsica and IFIMUP, Universidade do Porto, 4169-007 Porto, Portugal
author
  • Departamento e Centro de Quìmica, Universidade de Trás-os-Montes e Alto Douro, 5001-911 Vila Real, Portugal
author
  • Departamento de Fìsica and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal
author
  • Centro Brasileiro de Pesquisas Fìsicas, R. Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro-RJ, Brasil
author
  • Departamento de Fìsica and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv105n113kz
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