Study on the Magnetoresistance in La0.60Sr0.20K0.20-yyMnO3
The perovskite rare earth manganites polycrystalline samples La0.60Sr0.20K0.20-yyMnO3(y = 0, 0.03,0.05,0.07)were synthesized by sol-gel method. It is found that the vacancy-doping for the material can remarkably improve the CMR temperature stability of this kind material. Under an applied magnetic filed of 1.8 T, the MR vaule for the sample with y = 0.03 and y = 0.05 is about 4.7 %(±0.2 %)in the temperature range between 220 K and 320 K,so its temperature stability is better.
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