American Journal of Modern Physics

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Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State

Received: 14 March 2013    Accepted:     Published: 10 March 2013
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Abstract

Magnetocaloric effect (MCE) or T-effect was studied in La1-xSrxMnO3, Sm0.55Sr0.45MnO3 and PrBaMn2O6 manganites. It has been found that the maximum value of MCE, measured by direct method, is far less than obtainable by computation from the change of the magnetic entropy in Curie temperature TC. This phenomenon is explained by presence in them of the magnetic two-phase ferromagnetic (F) – antiferromagnetic (AF) state. So in La1-xSrxMnO3 the negative contribution from AF portion of sample lowers MCE and displacesmaximum on T(T)-curve to the higher temperature than TC on 20-40 K. Maximum on T(T) curve of Sm0.55Sr0.45MnO3 is disposed near TC=134 K in the cooling in the air single-crystal and ceramic samples. The cooling inoxygen of single-crystal,restored the Mn-O-Mn broken connections, increases the volume of clusters with CE-type of AF order, results to that maximum on T(T) curve is disposed at Neel temperature TN of this phase (243 K). Magnetic field, applied to sample during T-measurement, transforms AF clusters into F state and theboth types of clusters decompose at TN. The PrBaMn2O6 manganite has two phase transactions: paramagnetic–F at TC=295 K and F–AF at TN=231 K. Phase with spontaneous magnetization obtains the understated magnetic moment. Curve T(T) has the wide maximum near TC and the sharp minimum near TN with the small T-values in both extremes: 0,13 K and - 0,2 K respectively. This is connected with presence of AF interactions in F phase and F interactions in AF phase.

DOI 10.11648/j.ajmp.20130202.15
Published in American Journal of Modern Physics (Volume 2, Issue 2, March 2013)
Page(s) 61-67
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Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Magnetocaloric Effect, Nagnetization, Paramagnetic Susceptibility, Magnetic Two-Phase State, Manganite

References
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Author Information
  • M.V. Lomonosov Moscow State University, 119992 Leninskie Gory, Moscow, Russia

  • M.V. Lomonosov Moscow State University, 119992 Leninskie Gory, Moscow, Russia

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    L. I. Koroleva, A. S. Morozov. (2013). Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State. American Journal of Modern Physics, 2(2), 61-67. https://doi.org/10.11648/j.ajmp.20130202.15

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    L. I. Koroleva; A. S. Morozov. Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State. Am. J. Mod. Phys. 2013, 2(2), 61-67. doi: 10.11648/j.ajmp.20130202.15

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    L. I. Koroleva, A. S. Morozov. Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State. Am J Mod Phys. 2013;2(2):61-67. doi: 10.11648/j.ajmp.20130202.15

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  • @article{10.11648/j.ajmp.20130202.15,
      author = {L. I. Koroleva and A. S. Morozov},
      title = {Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State},
      journal = {American Journal of Modern Physics},
      volume = {2},
      number = {2},
      pages = {61-67},
      doi = {10.11648/j.ajmp.20130202.15},
      url = {https://doi.org/10.11648/j.ajmp.20130202.15},
      eprint = {https://download.sciencepg.com/pdf/10.11648.j.ajmp.20130202.15},
      abstract = {Magnetocaloric effect (MCE) or T-effect was studied in La1-xSrxMnO3, Sm0.55Sr0.45MnO3 and PrBaMn2O6 manganites. It has been found that the maximum value of MCE, measured by direct method, is far less than obtainable by computation from the change of the magnetic entropy in Curie temperature TC. This phenomenon is explained by presence in them of the magnetic two-phase ferromagnetic (F) – antiferromagnetic (AF) state. So in La1-xSrxMnO3 the negative contribution from AF portion of sample lowers MCE and displacesmaximum on T(T)-curve to the higher temperature than TC on 20-40 K. Maximum on T(T) curve of Sm0.55Sr0.45MnO3 is disposed near TC=134 K in the cooling in the air single-crystal and ceramic samples. The cooling inoxygen of single-crystal,restored the Mn-O-Mn broken connections, increases the volume of clusters with CE-type of AF order, results to that maximum on T(T) curve is disposed at Neel temperature TN of this phase (243 K). Magnetic field, applied to sample during T-measurement, transforms AF clusters into F state and theboth types of clusters decompose at TN. The PrBaMn2O6 manganite has two phase transactions: paramagnetic–F at TC=295 K and F–AF at TN=231 K. Phase with spontaneous magnetization obtains the understated magnetic moment. Curve T(T) has the wide maximum near TC and the sharp minimum near TN with the small T-values in both extremes: 0,13 K and - 0,2 K respectively. This is connected with presence of AF interactions in F phase and F interactions in AF phase.},
     year = {2013}
    }
    

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  • TY  - JOUR
    T1  - Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State
    AU  - L. I. Koroleva
    AU  - A. S. Morozov
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    PY  - 2013
    N1  - https://doi.org/10.11648/j.ajmp.20130202.15
    DO  - 10.11648/j.ajmp.20130202.15
    T2  - American Journal of Modern Physics
    JF  - American Journal of Modern Physics
    JO  - American Journal of Modern Physics
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    PB  - Science Publishing Group
    SN  - 2326-8891
    UR  - https://doi.org/10.11648/j.ajmp.20130202.15
    AB  - Magnetocaloric effect (MCE) or T-effect was studied in La1-xSrxMnO3, Sm0.55Sr0.45MnO3 and PrBaMn2O6 manganites. It has been found that the maximum value of MCE, measured by direct method, is far less than obtainable by computation from the change of the magnetic entropy in Curie temperature TC. This phenomenon is explained by presence in them of the magnetic two-phase ferromagnetic (F) – antiferromagnetic (AF) state. So in La1-xSrxMnO3 the negative contribution from AF portion of sample lowers MCE and displacesmaximum on T(T)-curve to the higher temperature than TC on 20-40 K. Maximum on T(T) curve of Sm0.55Sr0.45MnO3 is disposed near TC=134 K in the cooling in the air single-crystal and ceramic samples. The cooling inoxygen of single-crystal,restored the Mn-O-Mn broken connections, increases the volume of clusters with CE-type of AF order, results to that maximum on T(T) curve is disposed at Neel temperature TN of this phase (243 K). Magnetic field, applied to sample during T-measurement, transforms AF clusters into F state and theboth types of clusters decompose at TN. The PrBaMn2O6 manganite has two phase transactions: paramagnetic–F at TC=295 K and F–AF at TN=231 K. Phase with spontaneous magnetization obtains the understated magnetic moment. Curve T(T) has the wide maximum near TC and the sharp minimum near TN with the small T-values in both extremes: 0,13 K and - 0,2 K respectively. This is connected with presence of AF interactions in F phase and F interactions in AF phase.
    VL  - 2
    IS  - 2
    ER  - 

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