Unambiguous determining the Curie point in perovskite manganite with second-order phase transition by scaling method

Publication date: Available online 19 July 2019Source: Physics Letters AAuthor(s): Yunfei Xie, Jiyu Fan, Lisha Xu, Xiyuan Zhang, Ruixing Xu, Yan Zhu, Rujun Tang, Caixia Wang, Chunlan Ma, Li Pi, Yuheng Zhang, Hao YangAbstractThe 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.

Source: Physics Letters A - July 21, 2019 Category: Physics Source Type: research