Effect of High Resistivity Phase on Magnetoresistance of La0.7Ca0.2Sr0.1MnO3Report as inadecuate




Effect of High Resistivity Phase on Magnetoresistance of La0.7Ca0.2Sr0.1MnO3 - Download this document for free, or read online. Document in PDF available to download.

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.

KEYWORDS

manganites; Curie temperature; low field magnetoresistive; solid state reaction

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Author: Fen-fen Wei, Cao-shui Xiong, Juan Hou, Xiu-ying Gan, Hai-bin Cao, Jian-jun Zhang

Source: http://www.scirp.org/



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