Abstract
The samples of La0.6Dy0.1Sr0.3MnO3/x(CuO)(x=0.00, 0.08, 0.12, 0.16, 0.20) were prepared by the solid-state reaction method. Electric transport property and temperature stability of magnetoresistance of the samples were studied through X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM) photograph, resistivity–temperature (ρ–T) curves in zero field and in applied magnetic field, and magnetoresistance–temperature (MR–T) curves. With the increase of CuO content, resistivity increases, and ρ–T curves exhibit a peak near 320K, which is induced by double exchange. In the meantime, ρ–T curves exhibit a “shoulder peak” in the temperature range of 250–220K, which is induced by boundary effect. MR–T curves exhibit a sharp peak at high temperature, MR increases continuously with temperature decreasing in low temperature range, and MR exhibits a platform in the intermediate temperature range, then the temperature stability of magnetoresistance appears. For the sample with x=0.16, magnetoresistance keeps at 9.0±0.2% without change in the temperature range of 222–272K in the magnetic field of 0.8T. The intrinsic magnetoresistance and extrinsic magnetoresistance of samples have been discussed, and the mechanism of temperature stability of magnetoresistance is provided.
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