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

• Authors: M. Reis , A. Gomes , J. Araújo , P. Tavares , J. Amaral , I. Oliveira , V. Amaral
• Languages of publication: 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

75.30.Sg; 75.30.Kz; 75.80.+q

Discipline

• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)
• 75.80.+q: Magnetomechanical effects, magnetostriction(for magnetostrictive devices, see 85.70.Ec)
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 105
• Issue: 1-2
• Pages: 163-171

Dates

published

2004-01/02

received

2003-09-15

Contributors

author

M. Reis

• 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

A. Gomes

• Centro Brasileiro de Pesquisas Fìsicas, R. Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro-RJ, Brasil

author

J. Araújo

• Departamento de Fìsica and IFIMUP, Universidade do Porto, 4169-007 Porto, Portugal

author

P. Tavares

• Departamento e Centro de Quìmica, Universidade de Trás-os-Montes e Alto Douro, 5001-911 Vila Real, Portugal

author

J. Amaral

• Departamento de Fìsica and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal

author

I. Oliveira

• Centro Brasileiro de Pesquisas Fìsicas, R. Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro-RJ, Brasil

author

V. Amaral

• Departamento de Fìsica and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal

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Identifiers

DOI

10.12693/APhysPolA.105.163