采用改进的溶胶-凝胶法制备了La2.5-2xK0.5+2xMn2O7+δ (x=0.075) 和La1-xKxMnO3+δ (x=0.075)钙钛矿材料, 对比研究了两类化合物的结构、磁卡和磁电阻效应. 结果表明层状钙钛矿具有独特的结构和输运特性, 并具有比较大的低温磁电阻效应, 这是由电荷在双Mn2O面内和面间各向异性的输运行为决定的. 两类材料表现出相近的磁学性质和磁卡效应, 说明层状钙钛矿材料的磁性质主要由面内Mn-O双交换作用所决定.
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