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Peng Z.,Anhui Key Laboratory of Spintronics and Nano materials Research | Peng Z.,Hefei University of Technology | Wang G.,Anhui Key Laboratory of Spintronics and Nano materials Research | Tang Y.,Anhui Key Laboratory of Spintronics and Nano materials Research | And 2 more authors.
Rare Metals | Year: 2010

La0.5Sm0.2Sr0.3MnO3/(Ag 2O) x/2 (x = 0.00, 0.04, 0.08, 0.25, 0.30) samples were prepared by the solid-state reaction method, and their transport behaviors, transport mechanism, and magnetoresistance effect were studied through the measurement and fitting of ρ-T curves. The results show that the element Ag takes part in reaction when the doping amount is small. Ag is mainly distributed at the grain boundary of the host material and is in metallic state when the doping amount is relatively large; then the system becomes a two-phase composite. A small amount of Ag doping can apparently increase grain-boundary magnetoresistance induced by the spin-dependent scattering. The resistivity of the sample doped with 30 mol% Ag is one order of magnitude smaller than that of low-doped samples, and its magnetoresistance in the magnetic field of 0.5 T and at 300 K is strengthened apparently reaching 9.4%, which is connected not only with the improvement of the grain-boundary structure of the host material but also with the decrease of material resistivity. © 2010 Journal Publishing Center of University of Science and Technology Beijing and Springer Berlin Heidelberg.


Wang G.,Anhui Key Laboratory of Spintronics and Nano Materials Research | Peng Z.,Anhui Key Laboratory of Spintronics and Nano Materials Research | Peng Z.,Hefei University of Technology | Tang Y.,Anhui Key Laboratory of Spintronics and Nano Materials Research | And 2 more authors.
Xiyou Jinshu / Chinese Journal of Rare Metals | Year: 2010

La0.5Sm0.2Sr0.3MnO3 /(Ag2O)x/2(x=0.00, 0.04, 0.08, 0.25, 0.30) samples were prepared using the solid-state reaction method, and their transport behavior and magnetoresistance effect were studied through X-ray diffraction(XRD), scanning electron microscope(SEM) photos, energy dispersion spectrum(EDS) of SEM and ρ-T curves. The results showed that: Ag volatilized completely when the doping amount was small. Ag was mainly distributed at the grain boundary of the mother body and was in metallic state when the doping amount was relatively larger, then the system became a two-phase composite. The resistivity of the sample doped with 30% Ag was one order of magnitude smaller than that of low-doped samples, and its magnetoresistance in the magnetic field of 0.5 T and at 300 K strengthens increased apparently and reached 9.4%. This was due to the improvement of grain-boundary structure of the mother body and the decrease of material resistivity. © Right.

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