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)

• 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

References

• 1. S.Yu. Dan'kov, A.M. Tishin, V.K. Pecharsky, K.A. Gschneidner Jr., Phys. Rev. B, 57, 3478, 1998
• 2. V.K. Pecharsky, K.A. Gschneidner Jr., Phys. Rev. Lett., 78, 4494, 1997
• 3. O. Tegus, E. Brück, K.H.J. Buschow, F.R. de Boer, Nature, 415, 150, 2002
• 4. S. Fujieda, A. Fujita, K. Fukamichi, Appl. Phys. Lett., 81, 1276, 2002
• 5. Z.B. Guo, Y.W. Du, J.S. Zhu, H. Huang, W.P. Ding, D. Feng, Phys. Rev. Lett., 78, 1142, 1997
• 6. Colossal Magnetoresistive Oxides, Ed. Y. Tokura, Gordon and Breach, Singapore 2000
• 7. Colossal Magnetoresistance, Charge Ordering and Related Properties of Manganese Oxides, Eds. C.N.R. Rao, B. Raveau, World Scientific, Singapore 1998
• 8. M.W. Zemansky, Heat and Thermodynamics, 5th ed., McGraw-Hill, Kogakusha, Japan 1968
• 9. J.P. Araújo, V.S. Amaral, P.B. Tavares, A.A.C.S. Lourenço, F. Lencart-Silva, E. Alves, J.B. Sousa, J.M. Vieira, J. Magn. Magn. Mater., 226-230, 797, 2001
• 10. V.S. Amaral, J.P. Araújo, Yu.G. Pogorelov, J.B. Sousa, P.B. Tavares, J.M. Vieira, J. Magn. Magn. Mater., 242-245, 655, 2002
• 11. V.S. Amaral, J.P. Araújo, Yu.G. Pogorelov, J.M.B. Lopes dos Santos, P.B. Tavares, A.A.C.S. Lourenço, J.B. Sousa, J.M. Vieira, J. Magn. Magn. Mater., 226-230, 837, 2001
• 12. V.S. Amaral, J.P. Araújo, Yu.G. Pogorelov, J.B. Sousa, P.B. Tavares, J.M. Vieira, P.A. Algarabel, M.R. Ibarra, J. Appl. Phys. , 93, 7646, 2003
• 13. D.I. Uzunov, Introduction to the Theory of Critical Phenomena, World Scientific, Singapore 1993
• 14. J.L. Alonso, L.A. Fernández, F. Guinea, V. Laliena, V. Martín-Mayor, Phys. Rev. B, 63, 054411, 2001
• 15. N.A. de Oliveira, P.J. von Ranke, M.V. Tovar Costa, A. Troper, Phys. Rev. B, 66, 094402, 2002
• 16. A. Fujita, S. Fujieda, Y. Hasegawa, K. Fukamichi, Phys. Rev. B, 67, 104416, 2003
• 17. Y. Tomioka, A. Asamitsu, H. Kuwahara, Y. Moritomo, Y. Tokura, Phys. Rev. B, 53, R1689, 1996
• 18. V. Hardy, A. Wahl, C. Martin, Ch. Simon, Phys. Rev. B, 63, 224403, 2001
• 19. P. Chen, Y.W. Du, G. Ni, Europhys. Lett., 52, 589, 2000
• 20. P. Sande, L.E. Hueso, D.R. Miguéns, J. Rivas, F. Rivadulla, M.A. López-Quintela, Appl. Phys. Lett., 79, 2040, 2001

Identifiers

DOI

10.12693/APhysPolA.105.163