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在Mn位替代钙钛石氧化物La0.67Ca0.33(Mn,Fe)O3中观察到分步磁化现象，并在临界场附近获得大于104%的超大磁电阻效应.指出自旋玻璃相中反铁磁团簇在外磁场下的熔化是分步磁化的物理起因.The step magnetization is observed in spin glass manganites La0.67Ca0.33(Mn,Fe)O3, and the colossal magnetoresistance larger than 104%(ΔR/RH) is obtained near the critical field.The micro-origin of the novel step magnetism is attributed to the melting of antiferromagnetic clusters in the applied magnetic field.
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