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所属单位：理学院
发表刊物：JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
关键字：INTERPLANE TUNNELING MAGNETORESISTANCE LAYERED MANGANITE ROOM-TEMPERATURE PHASE-SEPARATION RESISTIVITY TRANSPORT SKYRMIONS CRYSTAL FILMS
摘要：In this study, we investigated the structural, magnetic phase transition, and magnetocaloric properties of bilayer perovskite manganite La1.38Sr1.62Mn2O7 based on Xray diffraction, electron paramagnetic resonance, and temperature-/magnetic field-dependent magnetization measurements. The structural characterization results showed the prepared sample had a tetragonal structure with the space group 14/mmm. The Curie temperature was determined as 114 K in the magnetization studies and a second-order paramagnetic-ferromagnetic transition was confirmed by the Arrott plot, which showed that the slopes were positive for all the curves. According to the variation in the electron paramagnetic resonance spectrum, we detected obvious electronic phase separation across a broad temperature range from 220 to 80 K in this magnetic material, thereby indicating that the paramagnetic and ferromagnetic phases coexist above as well as below the Curie temperature. Based on a plot of the isothermal magnetization versus the magnetic applied field, we deduced the maximum magnetic entropy change, which only reached 1.89 J/kg.K under an applied magnetic field of 7.0 T. These theoretical investigations indicated that in addition to the magnetoelastic couplings and electron interaction, electronic phase separation and anisotropic exchange interactions also affect the magnetic entropy changes in this bilayer manganite.
ISSN号：0022-3697
是否译文：否
发表时间：2018-04-01
合写作者：Xie, Yunfei,Xu, Lisha,胡大治,Ma, Chunlan,Ling, Langsheng,Tong, Wei,Pi, Li,Zhang, Yuheng,樊济宇
通讯作者：杨玉娥,樊济宇