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Anisotropic and excellent magnetocaloric properties of La0.7Ca0.3MnO3 single crystal with anomalous magnetization

Journal Article


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Abstract


  • Magnetic properties and the magnetocaloric effect (MCE) have been investigated in La0.7Ca0.3MnO3 single

    crystal with applied field along both the ab-plane and the c-direction. Due to the magnetocrystalline

    anisotropy, the crystal exhibits anisotropy in the MCE. Upon application of a 5 T field, the magnetic

    entropy changes (SM), reaching values of 7.668 J/(kg K) and 6.412 J/(kg K) for both the ab-plane and

    the c-direction, respectively. A magnetic entropy change of 3.3 J/(kg K) was achieved for a magnetic field

    change of 1.5 T at the Curie temperature, TC = 245 K. Due to the absence of grains in the single crystal,

    the SM distribution here is much more uniform than for gadolinium (Gd) and other polycrystalline

    manganites, which is desirable for an Ericsson-cycle magnetic refrigerator. For a field change of 5 T, the

    relative cooling power, RCP, reached 358.17 J/kg, while the maximum adiabatic temperature change of

    5.33 K and a magnetoresistance (MR) ratio of 507.88% at TC were observed. We analysed the magnetization

    of La0.7Ca0.3MnO3 single crystal at TC and estimated several parameters of spin fluctuation on the basis of

    a self-consistent renormalization theory of spin fluctuations, with reciprocal susceptibility above TC. We

    found that the magnetic property of La0.7Ca0.3MnO3 is weakly itinerant ferromagnetic. A large reversible

    MCE and no hysteresis loss with a considerable value of refrigerant capacity indicate that La0.7Ca0.3MnO3

    single crystal is a potential candidate as a magnetic refrigerant.

UOW Authors


  •   Debnath, J C. (external author)
  •   Zeng, R (external author)
  •   Kim, Jung Ho
  •   Chen, Dapeng (external author)
  •   Dou, Shi

Publication Date


  • 2012

Citation


  • Debnath, J. C., Zeng, R., Kim, J., Chen, D. & Dou, S. X. (2012). Anisotropic and excellent magnetocaloric properties of La0.7Ca0.3MnO3 single crystal with anomalous magnetization. Materials Science and Engineering B: Advanced Functional Solid-state Materials, 177 (1), 48-53.

Scopus Eid


  • 2-s2.0-81055140225

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1269&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/270

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 48

End Page


  • 53

Volume


  • 177

Issue


  • 1

Place Of Publication


  • Switzerland

Abstract


  • Magnetic properties and the magnetocaloric effect (MCE) have been investigated in La0.7Ca0.3MnO3 single

    crystal with applied field along both the ab-plane and the c-direction. Due to the magnetocrystalline

    anisotropy, the crystal exhibits anisotropy in the MCE. Upon application of a 5 T field, the magnetic

    entropy changes (SM), reaching values of 7.668 J/(kg K) and 6.412 J/(kg K) for both the ab-plane and

    the c-direction, respectively. A magnetic entropy change of 3.3 J/(kg K) was achieved for a magnetic field

    change of 1.5 T at the Curie temperature, TC = 245 K. Due to the absence of grains in the single crystal,

    the SM distribution here is much more uniform than for gadolinium (Gd) and other polycrystalline

    manganites, which is desirable for an Ericsson-cycle magnetic refrigerator. For a field change of 5 T, the

    relative cooling power, RCP, reached 358.17 J/kg, while the maximum adiabatic temperature change of

    5.33 K and a magnetoresistance (MR) ratio of 507.88% at TC were observed. We analysed the magnetization

    of La0.7Ca0.3MnO3 single crystal at TC and estimated several parameters of spin fluctuation on the basis of

    a self-consistent renormalization theory of spin fluctuations, with reciprocal susceptibility above TC. We

    found that the magnetic property of La0.7Ca0.3MnO3 is weakly itinerant ferromagnetic. A large reversible

    MCE and no hysteresis loss with a considerable value of refrigerant capacity indicate that La0.7Ca0.3MnO3

    single crystal is a potential candidate as a magnetic refrigerant.

UOW Authors


  •   Debnath, J C. (external author)
  •   Zeng, R (external author)
  •   Kim, Jung Ho
  •   Chen, Dapeng (external author)
  •   Dou, Shi

Publication Date


  • 2012

Citation


  • Debnath, J. C., Zeng, R., Kim, J., Chen, D. & Dou, S. X. (2012). Anisotropic and excellent magnetocaloric properties of La0.7Ca0.3MnO3 single crystal with anomalous magnetization. Materials Science and Engineering B: Advanced Functional Solid-state Materials, 177 (1), 48-53.

Scopus Eid


  • 2-s2.0-81055140225

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1269&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/270

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 48

End Page


  • 53

Volume


  • 177

Issue


  • 1

Place Of Publication


  • Switzerland