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Author(s): |
Fen-fen Wei, Key Laboratory of Ecophysics and Department of Physics, Normal College, Shihezi University, Shihezi 832003, China
Cao-shui Xiong, Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Juan Hou, Key Laboratory of Ecophysics and Department of Physics, Normal College, Shihezi University, Shihezi 832003, China
Xiu-ying Gan, Key Laboratory of Ecophysics and Department of Physics, Normal College, Shihezi University, Shihezi 832003, China
Hai-bin Cao, Key Laboratory of Ecophysics and Department of Physics, Normal College, Shihezi University, Shihezi 832003, China
Jian-jun Zhang, Key Laboratory of Ecophysics and Department of Physics, Normal College, Shihezi University, Shihezi 832003, China |
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Abstract: |
La0.7Ca0.2Sr0.1MnO3/xCoFe2O4 (LCSMO/xCFO) samples were prepared by solid state reaction method. X-ray diffraction (XRD), scanning electronic microscopy (SEM), vibrating sample magnetometer (VSM) and Dc four probed method were used to investigate the structure and properties. The results show that that CFO mainly segregated at the boundaries of LCSMO grains, which did not change the structure of LCSMO. In the doping range of 0 ~ 0.35, the resistivity rises remarkably, furthermore, the resistivity versus appears double peaks with increasing CFO doping amount. While TC is unchanged, TC is a dividing point, the magnetization changed with the increase of CFO. The composites present a sizable magnetoresistance at much lower temperature than TP when applied a small field (~3 kOe), this is an extrinsic MR effect, and the magnetic scattering of polarized charge carriers may be responsible for enhanced extrinsic MR of the composites.
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