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Exploiting Magnetism and Magnetocaloric Effect in Nd0.55Sr0.45Mn0.98Ga0.02 O 3

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Abstract

We report results of the magnetization and magnetocaloric effect in lightly Ga-doped perovskite manganites Nd0.55Sr0.45Mn0.98Ga0.02 O 3. It undergoes a second-order paramagnetic to ferromagnetic transition at T C = 250 K and shows a strong ferromagnetic properties below T C . However, an obvious upward deviation from the Curie-Weiss law far above T C indicates the existence of non-Griffiths-like behavior in paramagnetic phase. Together with the measurements of isothermal magnetization around the Curie temperature, the unsaturated magnetization curves under high magnetic field of 7.0 T imply that the Ga-substitution causes the formation of antiferromagnetic phase due to some localized charge order phases generated in this composition. Based on the data of isothermal magnetization measured around T C and Maxwell relation, we have calculated the maximum isothermal magnetic entropy change of 6.23 J/kg K for Δμ 0H = 7.0 T magnetic field variation. Though only a moderate magnetic entropy change were obtained, a considerable large relative cooling power of 260 J/kg for Δμ 0H = 7.0 T and 182 J/kg for Δμ 0H = 5.0 T were found in this sample, this ensure it to be a potential candidate material to be applied in the magnetic refrigeration.

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Acknowledgment

This work was supported by the National Nature Science Foundation of China (Grant nos. 11574322 and U1332140) and the Foundation for Users with Potential of Hefei Science Center (CAS) through Grant No. 2015HSC-UP001.

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Authors and Affiliations

  1. Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Bo Yu, Xiufeng Lan, Weichun Zhang & Jiyu Fan

  2. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China

    Hui Han & Lei Zhang

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  1. Bo Yu
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  2. Hui Han
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Correspondence to Jiyu Fan.

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Yu, B., Han, H., Lan, X. et al. Exploiting Magnetism and Magnetocaloric Effect in Nd0.55Sr0.45Mn0.98Ga0.02 O 3 . J Supercond Nov Magn 30, 2227–2232 (2017). https://doi.org/10.1007/s10948-017-4046-0

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