Effective Way to Improve the Magnetoresistance Effect in Perovskite at Room Temperature

Bao Xin Huang; Jian Li; Jun Hua Wang; Ke Zheng Chen; Yi Hua Liu; Liang Mo Mei

doi:10.4028/www.scientific.net/MSF.704-705.954

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HomeMaterials Science ForumMaterials Science Forum Vols. 704-705Effective Way to Improve the Magnetoresistance...

Effective Way to Improve the Magnetoresistance Effect in Perovskite at Room Temperature

Abstract:

The magnetic and electrical properties of the La_0.67Ca_0.25Sr_0.08MnO₃/xAg composite system are systematically investigated as a function of Ag-added content. With increasing the Ag dopant amount, the magnetization decreases a little while Curie temperature (T_C) is almost independent of Ag content around 312 K. The resistivity reduces rapidly with Ag addition ( x < 0.25 ) due to the decomposed metal Ag, and then it increases slightly which is probably induced by the less Ag content related to the volatilization of Ag during calcinations. At low temperature, the ρ – T curves ﬁt well by the expression of ρ =ρ₀ +ρ₂T² +ρ_4.5T^4.5 while all data for the above T_Ccan be ﬁtted by using the adiabatic small-polaron-hopping model ρ=ρ₀T exp (E/k_BT ). The enhancement of MR effect ( 41% ) at room temperature is mainly related to the coexistence of intrinsic MR properties and the spin dependent scattering of conduction electrons at the interfaces. These results indicate that combining the doping effect with the composite method is an effective selection in enhancement of MR at room temperature, which is very meaningful for the application research.

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Materials Science Forum (Volumes 704-705)

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954-959

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.704-705.954

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Online since:

December 2011

Authors:

Bao Xin Huang, Jian Li, Jun Hua Wang, Ke Zheng Chen, Yi Hua Liu, Liang Mo Mei

Keywords:

Colossal Magnetoresistance, Granular Manganites, Spin-Dependent Scattering, Two-Phase Composites

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