Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State

L. I. Koroleva; A. S. Morozov

doi:doi:10.11648/j.ajmp.20130202.15

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Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State

L. I. Koroleva, A. S. Morozov

Published in American Journal of Modern Physics (Volume 2, Issue 2)

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.

Published in	American Journal of Modern Physics (Volume 2, Issue 2)
DOI	10.11648/j.ajmp.20130202.15
Page(s)	61-67
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2013. Published by Science Publishing Group

Keywords

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

References

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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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ACS Style

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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AMA Style

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://article.sciencepublishinggroup.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
Y1  - 2013/03/10
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
SP  - 61
EP  - 67
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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Author Information

L. I. Koroleva

M.V. Lomonosov Moscow State University, 119992 Leninskie Gory, Moscow, Russia
A. S. Morozov

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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ACS Style

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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AMA Style

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://article.sciencepublishinggroup.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}
}

Copy | Download

TY  - JOUR
T1  - Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State
AU  - L. I. Koroleva
AU  - A. S. Morozov
Y1  - 2013/03/10
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
SP  - 61
EP  - 67
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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