Unambiguous determining the Curie point in perovskite manganite with second-order phase transition by scaling method |
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| Authors: | Yunfei Xie Jiyu Fan Lisha Xu Xiyuan Zhang Ruixing Xu Yan Zhu Rujun Tang Caixia Wang Chunlan Ma Li Pi Yuheng Zhang Hao Yang |
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| Institution: | 1. Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. School of Physical Science and Technology, Soochow University, Suzhou 215006, China;3. College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China;4. Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China;5. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China |
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| Abstract: | The accurate determination of the Curie temperature (TC) is particularly important in describing the magnetic behavior close to the paramagnetic-ferromagnetic (PM-FM) phase transition. In this paper, we studied the magnetic phase transition and accurately predicted the Curie point of perovskite manganite La0.825Sr0.175MnO3. We find the compound shows a second-order PM-FM transition and has a large magnetic entropy change (MEC) in vicinity of phase transition region. Based on the scaling law and the correlation between magnetic field and MEC, the precise and magnetic-independent Curie temperature was determined to be 281.7 K, obviously lower than 285.4 K decided from the magnetization versus temperature. The reliability of new Curie temperature can be well confirmed by the modified Arrott plot together with the critical exponents. Our results not only open up a new pathway for precise definition of Curie point but also facilitate the efficient exploitation of spontaneous magnetic bubbles in perovskite manganite. |
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| Keywords: | Corresponding authors Scaling law Manganite Magnetocaloric effect Phase transitions |
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