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Preparation, magnetoresistance and magnetocaloric effect of two-layered perovskite La 2.5- xK 0.5+ xMn 2O 7+δ

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Abstract:

Polycrystalline two-layered perovskite La2.5-xK0.5+xMn2O 7 + δ (0 < x < 0.5) samples have been prepared by a modified sol-gel method and their magnetoresistance and magnetocaloric effects have been studied. A large deviation between the metal-insulator (MI) transition temperature (T ρ ) and the magnetic transition temperature (TC) is observed. Large magnetoresistance (MR) effects with Δρ/ρ of ∼40% at 12 kOe are obtained in wide temperature ranges. The maximum of the magnetic entropy change peaks at its Curie temperature (TC), far above its MI transition temperature (T ρ ). The large magnetic entropy change (∼1.4 J/kg.K) is obtained in the sample La2.5-xK0.5+xMn2O 7 + δ (x = 0.35) upon 10 kOe applied magnetic field.

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Authors and Affiliations

  1. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, PR China, , , , , , CN

    W. Zhong, H.Y. Jiang, X.S. Liu & Y.W. Du

  2. Department of Physics, Heibei Normal University, Shijiazhuang 050091, PR China, , , , , , CN

    W. Chen

  3. Chemistry Department and Center for Surface Analysis and Research, Hong Kong Baptist University, Kowloon Tong, PR China, , , , , , HK

    C.T. Au

Authors
  1. W. Zhong
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  2. W. Chen
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  3. H.Y. Jiang
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  4. X.S. Liu
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  5. C.T. Au
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  6. Y.W. Du
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Additional information

Received 2 May 2002 / Received in final form 1st October 2002 Published online 19 December 2002

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ID="a"e-mail: wzhong@ufp.nju.edu.cn

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Zhong, W., Chen, W., Jiang, H. et al. Preparation, magnetoresistance and magnetocaloric effect of two-layered perovskite La 2.5- xK 0.5+ xMn 2O 7+δ . Eur. Phys. J. B 30, 331–337 (2002). https://doi.org/10.1140/epjb/e2002-00386-3

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  • DOI: https://doi.org/10.1140/epjb/e2002-00386-3

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