采用固相反应法使提前制备好的La0.6Sr0.25K0.15MnO3与AgNO3复合,制备了La0.6Sr025K0.15MnO3+xAg(x=0.04,0.06,0.08)系列复合样品.我们在样品的相结构、磁性质及其磁电阻效应方面进行了研究.通过相结构的研究发现:复合样品中除了有钙钛矿主相外还有少量Ag相和Mn3O4相.通过对样品的磁性测量发现:复合样品对母体样品的比饱和磁化强度和居里温度的影响很小.复合后,母体样品的磁电阻温度稳定性得到很好改善.当x=0.04时,在290 ~ 352 K的温度范围内,磁电阻值稳定在5.0%±0.2%;当x=0.06时,在260~307 K的温度范围内,磁电阻值保持在3.8%±0.2%;在282 ~339 K内x=0.08的复合样品的磁电阻值保持在5.03%±0.12%.本征磁电阻与隧穿磁电阻竞争的结果是导致磁电阻值的温度稳定性的机制.
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